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:
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   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:

Keep \Keep\, v. i.
   1. To remain in any position or state; to continue; to abide;
      to stay; as, to keep at a distance; to keep aloft; to keep
      near; to keep in the house; to keep before or behind; to
      keep in favor; to keep out of company, or out reach.
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   2. To last; to endure; to remain unimpaired.
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            If the malt be not thoroughly dried, the ale it
            makes will not keep.                  --Mortimer.
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   3. To reside for a time; to lodge; to dwell. [Now disused
      except locally or colloquially.]
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            Knock at his study, where, they say, he keeps.
                                                  --Shak.
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   4. To take care; to be solicitous; to watch. [Obs.]
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            Keep that the lusts choke not the word of God that
            is in us.                             --Tyndale.
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   5. To be in session; as, school keeps to-day. [Colloq.]
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   To keep from, to abstain or refrain from.

   To keep in with, to keep on good terms with; as, to keep in
      with an opponent.

   To keep on, to go forward; to proceed; to continue to
      advance.

   To keep to, to adhere strictly to; not to neglect or
      deviate from; as, to keep to old customs; to keep to a
      rule; to keep to one's word or promise.

   To keep up, to remain unsubdued; also, not to be confined
      to one's bed.
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