The Collaborative International Dictionary of English v.0.48:

In- \In-\ ([i^]n-). [See In, prep. Cf. Em-, En-.]
   A prefix from Eng. prep. in, also from Lat. prep. in, meaning
   in, into, on, among; as, inbred, inborn, inroad; incline,
   inject, intrude. In words from the Latin, in- regularly
   becomes il- before l, ir- before r, and im- before a labial;
   as, illusion, irruption, imblue, immigrate, impart. In- is
   sometimes used with an simple intensive force.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

In- \In-\ ([i^]n-). [L. in-; akin to E. un-. See Un-.]
   An inseparable prefix, or particle, meaning not, non-, un-
   as, inactive, incapable, inapt. In- regularly becomes il-
   before l, ir- before r, and im- before a labial.
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The Collaborative International Dictionary of English v.0.48:

-in \-in\
   A suffix. See the Note under -ine.
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The Collaborative International Dictionary of English v.0.48:

In \In\, prep. [AS. in; akin to D. & G. in, Icel. [imac], Sw. &
   Dan. i, OIr. & L. in, Gr. 'en. [root]197. Cf. 1st In-,
   Inn.]
   The specific signification of in is situation or place with
   respect to surrounding, environment, encompassment, etc. It
   is used with verbs signifying being, resting, or moving
   within limits, or within circumstances or conditions of any
   kind conceived of as limiting, confining, or investing,
   either wholly or in part. In its different applications, it
   approaches some of the meanings of, and sometimes is
   interchangeable with, within, into, on, at, of, and among. It
   is used:
   [1913 Webster]

   1. With reference to space or place; as, he lives in Boston;
      he traveled in Italy; castles in the air.
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            The babe lying in a manger.           --Luke ii. 16.
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            Thy sun sets weeping in the lowly west. --Shak.
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            Situated in the forty-first degree of latitude.
                                                  --Gibbon.
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            Matter for censure in every page.     --Macaulay.
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   2. With reference to circumstances or conditions; as, he is
      in difficulties; she stood in a blaze of light. "Fettered
      in amorous chains." --Shak.
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            Wrapt in sweet sounds, as in bright veils.
                                                  --Shelley.
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   3. With reference to a whole which includes or comprises the
      part spoken of; as, the first in his family; the first
      regiment in the army.
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            Nine in ten of those who enter the ministry.
                                                  --Swift.
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   4. With reference to physical surrounding, personal states,
      etc., abstractly denoted; as, I am in doubt; the room is
      in darkness; to live in fear.
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            When shall we three meet again,
            In thunder, lightning, or in rain?    --Shak.
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   5. With reference to character, reach, scope, or influence
      considered as establishing a limitation; as, to be in
      one's favor. "In sight of God's high throne." --Milton.
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            Sounds inharmonious in themselves, and harsh.
                                                  --Cowper.
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   6. With reference to movement or tendency toward a certain
      limit or environment; -- sometimes equivalent to into; as,
      to put seed in the ground; to fall in love; to end in
      death; to put our trust in God.
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            He would not plunge his brother in despair.
                                                  --Addison.
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            She had no jewels to deposit in their caskets.
                                                  --Fielding.
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   7. With reference to a limit of time; as, in an hour; it
      happened in the last century; in all my life.
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   In as much as, or Inasmuch as, in the degree that; in
      like manner as; in consideration that; because that;
      since. See Synonym of Because, and cf. For as much
      as, under For, prep.

   In that, because; for the reason that. "Some things they do
      in that they are men . . .; some things in that they are
      men misled and blinded with error." --Hooker.

   In the name of, in behalf of; on the part of; by authority;
      as, it was done in the name of the people; -- often used
      in invocation, swearing, praying, and the like.

   To be in for it.
      (a) To be in favor of a thing; to be committed to a
          course.
      (b) To be unable to escape from a danger, penalty, etc.
          [Colloq.]

   To be in with or To keep in with.
      (a) To be close or near; as, to keep a ship in with the
          land.
      (b) To be on terms of friendship, familiarity, or intimacy
          with; to secure and retain the favor of. [Colloq.]

   Syn: Into; within; on; at. See At.
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The Collaborative International Dictionary of English v.0.48:

In \In\ ([i^]n), v. t.
   To inclose; to take in; to harvest. [Obs.]
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         He that ears my land spares my team and gives me leave
         to in the crop.                          --Shak.
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The Collaborative International Dictionary of English v.0.48:

In \In\, adv.
   1. Not out; within; inside. In, the preposition, becomes an
      adverb by omission of its object, leaving it as the
      representative of an adverbial phrase, the context
      indicating what the omitted object is; as, he takes in the
      situation (i. e., he comprehends it in his mind); the
      Republicans were in (i. e., in office); in at one ear and
      out at the other (i. e., in or into the head); his side
      was in (i. e., in the turn at the bat); he came in (i. e.,
      into the house).
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            Their vacation . . . falls in so pat with ours.
                                                  --Lamb.
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   Note: The sails of a vessel are said, in nautical language,
         to be in when they are furled, or when stowed. In
         certain cases in has an adjectival sense; as, the in
         train (i. e., the incoming train); compare up grade,
         down grade, undertow, afterthought, etc.
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   2. (Law) With privilege or possession; -- used to denote a
      holding, possession, or seisin; as, in by descent; in by
      purchase; in of the seisin of her husband. --Burrill.
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   In and in breeding. See under Breeding.

   In and out (Naut.), through and through; -- said of a
      through bolt in a ship's side. --Knight.

   To be in, to be at home; as, Mrs. A. is in.

   To come in. See under Come.
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The Collaborative International Dictionary of English v.0.48:

In \In\, n.

   Note: [Usually in the plural.]
   1. One who is in office; -- the opposite of out.
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   2. A re["e]ntrant angle; a nook or corner.
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   Ins and outs,
      (a) nooks and corners; twists and turns.
      (b) the peculiarities or technicalities (of a subject);
          intricacies; details; -- used with of; as, he knew the
          ins and outs of the Washington power scene.
          [1913 Webster +PJC]

                All the ins and outs of this neighborhood. --D.
                                                  Jerrold.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tetrazine \Tet*raz"ine\, n. Also -in \-in\ . [Tetrazo- + -ine.]
   (Chem.)
   A hypothetical compound, C2H2N4 which may be regarded as
   benzene with four CH groups replaced by nitrogen atoms;
   also, any of various derivatives of the same. There are three
   isomeric varieties.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

in
    adv 1: to or toward the inside of; "come in"; "smash in the
           door" [syn: in, inwards, inward]
    adj 1: holding office; "the in party"
    2: directed or bound inward; "took the in bus"; "the in basket"
    3: currently fashionable; "the in thing to do"; "large shoulder
       pads are in"
    n 1: a unit of length equal to one twelfth of a foot [syn:
         inch, in]
    2: a rare soft silvery metallic element; occurs in small
       quantities in sphalerite [syn: indium, In, atomic number
       49]
    3: a state in midwestern United States [syn: Indiana, Hoosier
       State, IN]

Moby Thesaurus II by Grady Ward, 1.0:

108 Moby Thesaurus words for "in":
   a la mode, access, adit, advanced, air lock, among, an in,
   approach, at, avant-garde, by, chic, clout, contemporary, corridor,
   drag, entering, entrance, entranceway, entree, entry, entryway,
   far out, fashionable, favor, favorable regard, fellow feeling,
   forward-looking, friendly relations, from, gangplank, gangway,
   good graces, good terms, good understanding, goodwill, hall,
   harmony, herein, in favor, in with, inbound, incoming, inflooding,
   inflowing, influence, ingoing, ingress, ingressive, inlet,
   inpouring, inside, inside of, intake, into, intrusive, invasive,
   inward, inward-bound, inwardly, inwards, irruptive,
   means of access, mod, modern, modernistic, modernized, modish,
   mutual regard, near, newfashioned, next to, now, on, on good terms,
   on speaking terms, open arms, open door, opening, passage,
   passageway, present-day, present-time, progressive, rapport,
   regard, respect, streamlined, swank, swish, sympathy, therein, to,
   toward, trendy, twentieth-century, ultra-ultra, ultramodern,
   up-to-date, up-to-datish, up-to-the-minute, vestibule, way, way in,
   way out, with, with-it, within



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

IN
       Individual Network [e.v.] (org., ISP)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

IN
       Intelligent Network (ITU-T, Q.1200)


The Free On-line Dictionary of Computing (30 December 2018):

in

   1.  The country code for India.

   (1999-01-27)

   2. The typical type or "mode" of function parameter that
   passes information in one direction - from the caller to the
   function.  Other modes are out and inout.

   (2010-01-19)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

INN. A house where a traveller is furnished with every thing he has occasion
for while on his way. Bac. Ab. Inns. B; 12 Mod. 255; 3 B. & A. 283; 4 Campb.
77; 2 Chit. Rep. 484; 3 Chit. Com. Law, 365, n. 6.
     2. All travellers have a lawful right to enter an inn for the purpose
of being accommodated. It has been held that an innkeeper in a town through
which lines of stages pass, has no right to, exclude the driver of one of
these lines from his yard and the common public rooms, where travellers are
usually placed, who comes there at proper hours, and in a proper manner, to
solicit passengers for his coach, and without doing any injury to the
innkeeper. 8 N. H. R. 523; Hamm. N. P. 170. Vide Entry; Guest.