The Collaborative International Dictionary of English v.0.48:

Weekly \Week"ly\, a.
   1. Of or pertaining to a week, or week days; as, weekly
      labor.
      [1913 Webster]

   2. Coming, happening, or done once a week; hebdomadary; as, a
      weekly payment; a weekly gazette.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Weekly \Week"ly\, n.; pl. Weeklies.
   A publication issued once in seven days, or appearing once a
   week.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Weekly \Week"ly\, adv.
   Once a week; by hebdomadal periods; as, each performs service
   weekly.
   [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):

weekly
    adv 1: without missing a week; "she visited her aunt weekly"
           [syn: hebdomadally, weekly, every week, each
           week]
    adj 1: of or occurring every seven days; "a weekly visit";
           "weekly paper" [syn: weekly, hebdomadal,
           hebdomadary]
    n 1: a periodical that is published every week (or 52 issues per
         year)

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "weekly":
   annual, biannual, biennial, bimonthly, biweekly, catamenial,
   centenary, centennial, daily, daily newspaper, daybook, decennial,
   diary, diurnal, ephemeris, extra, extra edition, fortnightly,
   gazette, hebdomadal, hourly, journal, magazine, menstrual,
   momentary, momently, monthly, national newspaper,
   neighborhood newspaper, news, newsmagazine, newspaper,
   newspaper of record, organ, paper, periodical, pictorial,
   quarterly, quotidian, rag, review, secular, semestral, semiannual,
   semimonthly, semiweekly, semiyearly, serial, sheet, slick magazine,
   special, special edition, tabloid, tertian, trade magazine,
   triennial, weekly newspaper, yearbook, yearly