NOUN (1)

1. a periodical that is published every month (or 12 issues per year);


ADJECTIVE (1)

1. of or occurring or payable every month;
- Example: "monthly payments"
- Example: "the monthly newsletter"


ADVERB (1)

1. occurring once a month;
- Example: "they meet monthly"

The Collaborative International Dictionary of English v.0.48:

Monthly \Month"ly\, adv.
   1. Once a month; in every month; as, the moon changes
      monthly. --Shak.
      [1913 Webster]

   2. As if under the influence of the moon; in the manner of a
      lunatic. [Obs.] --Middleton.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Monthly \Month"ly\, a.
   1. Continued a month, or a performed in a month; as, the
      monthly revolution of the moon.
      [1913 Webster]

   2. Done, happening, payable, published, etc., once a month,
      or every month; as, a monthly visit; monthly charges; a
      monthly installment; a monthly magazine.
      [1913 Webster]

   Monthly nurse, a nurse who serves for a month or some short
      time, esp. one which attends women after childbirth.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Monthly \Month"ly\, n.; pl. Monthlies.
   A publication which appears regularly once a month.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cyclic \Cyc"lic\ (s?k"l?k or s?"kl?k), Cyclical \Cyc"lic*al\
   (s?k"l?-kal), a. [Cf. F. cycluque, Gr. kykliko`s, fr. ky`klos
   See Cycle.]
   1. Of or pertaining to a cycle or circle; moving in cycles;
      as, cyclical time. --Coleridge.
      [1913 Webster]

   2. (Chemistry) Having atoms bonded to form a ring structure.
      Opposite of acyclic.

   Note: Used most commonly in respect to organic compounds.

   Note: [Narrower terms: bicyclic; heterocyclic;
         homocyclic, isocyclic]

   Syn: closed-chain, closed-ring.
        [WordNet 1.5]

   3. Recurring in cycles[2]; having a pattern that repeats at
      approximately equal intervals; periodic. Opposite of
      noncyclic.

   Note: [Narrower terms: alternate(prenominal),
         alternating(prenominal); alternate(prenominal), every
         other(prenominal), every second(prenominal);
         alternating(prenominal), oscillating(prenominal);
         biyearly; circadian exhibiting 24-hour
         periodicity); circular; daily, diurnal;
         fortnightly, biweekly; hourly; midweek,
         midweekly; seasonal; semestral, semestrial;
         semiannual, biannual, biyearly; semiweekly,
         biweekly; weekly; annual, yearly; biennial;
         bimonthly, bimestrial; half-hourly; half-yearly;
         monthly; tertian, alternate(prenominal);
         triennial]
         [WordNet 1.5]

   4. Marked by repeated cycles[2].
      [WordNet 1.5]

   Cyclic chorus, the chorus which performed the songs and
      dances of the dithyrambic odes at Athens, dancing round
      the altar of Bacchus in a circle.

   Cyclic poets, certain epic poets who followed Homer, and
      wrote merely on the Trojan war and its heroes; -- so
      called because keeping within the circle of a single
      subject. Also, any series or coterie of poets writing on
      one subject. --Milman.
      [1913 Webster]

WordNet (r) 3.0 (2006):

monthly
    adv 1: occurring once a month; "they meet monthly"
    adj 1: of or occurring or payable every month; "monthly
           payments"; "the monthly newsletter"
    n 1: a periodical that is published every month (or 12 issues
         per year)

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "monthly":
   annual, biannual, biennial, bimonthly, biweekly, catamenial,
   centenary, centennial, daily, daybook, decennial, diary, diurnal,
   ephemeris, fortnightly, gazette, hebdomadal, hourly, journal,
   magazine, menstrual, momentary, momently, newsmagazine, organ,
   periodical, pictorial, quarterly, quotidian, review, secular,
   semestral, semiannual, semimonthly, semiweekly, semiyearly, serial,
   slick magazine, tertian, trade magazine, triennial, weekly,
   yearbook, yearly