The Collaborative International Dictionary of English v.0.48:

Regular \Reg"u*lar\ (r[e^]g"[-u]*l[~e]r), n. [LL. regularis: cf.
   F. r['e]gulier. See Regular, a.]
   1. (R. C. Ch.) A member of any religious order or community
      who has taken the vows of poverty, chastity, and
      obedience, and who has been solemnly recognized by the
      church. --Bp. Fitzpatrick.
      [1913 Webster]

   2. (Mil.) A soldier belonging to a permanent or standing
      army; -- chiefly used in the plural.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Regular \Reg"u*lar\ (-l?r), a. [L. regularis, fr. regula a rule,
   fr. regere to guide, to rule: cf. F. r['e]gulier. See
   Rule.]
   [1913 Webster]
   1. Conformed to a rule; agreeable to an established rule,
      law, principle, or type, or to established customary
      forms; normal; symmetrical; as, a regular verse in poetry;
      a regular piece of music; a regular verb; regular practice
      of law or medicine; a regular building.
      [1913 Webster]

   2. Governed by rule or rules; steady or uniform in course,
      practice, or occurence; not subject to unexplained or
      irrational variation; returning at stated intervals;
      steadily pursued; orderlly; methodical; as, the regular
      succession of day and night; regular habits.
      [1913 Webster]

   3. Constituted, selected, or conducted in conformity with
      established usages, rules, or discipline; duly authorized;
      permanently organized; as, a regular meeting; a regular
      physican; a regular nomination; regular troops.
      [1913 Webster]

   4. Belonging to a monastic order or community; as, regular
      clergy, in distinction dfrom the secular clergy.
      [1913 Webster]

   5. Thorough; complete; unmitigated; as, a regular humbug.
      [Colloq.]
      [1913 Webster]

   6. (Bot. & Zool.) Having all the parts of the same kind alike
      in size and shape; as, a regular flower; a regular sea
      urchin.
      [1913 Webster]

   7. (Crystallog.) Same as Isometric.
      [1913 Webster]

   Regular polygon (Geom.), a plane polygon which is both
      equilateral and equiangular.

   Regular polyhedron (Geom.), a polyhedron whose faces are
      equal regular polygons. There are five regular
      polyhedrons, -- the tetrahedron, the hexahedron, or cube,
      the octahedron, the dodecahedron, and the icosahedron.

   Regular sales (Stock Exchange), sales of stock deliverable
      on the day after the transaction.

   Regular troops, troops of a standing or permanent army; --
      opposed to militia.
      [1913 Webster]

   Syn: Normal; orderly; methodical. See Normal.
        [1913 Webster]

WordNet (r) 3.0 (2006):

regular
    adj 1: in accordance with fixed order or procedure or principle;
           "his regular calls on his customers"; "regular meals";
           "regular duties" [ant: irregular]
    2: often used as intensifiers; "a regular morass of details"; "a
       regular nincompoop"; "he's a veritable swine" [syn:
       regular(a), veritable(a)]
    3: conforming to a standard or pattern; "following the regular
       procedure of the legislature"; "a regular electrical outlet"
    4: regularly scheduled for fixed times; "at a regular meeting of
       the PTA"; "regular bus departures"
    5: in accord with regular practice or procedure; "took his
       regular morning walk"; "her regular bedtime"
    6: occurring at fixed intervals; "a regular beat"; "the even
       rhythm of his breathing" [syn: even, regular]
    7: relating to a person who does something regularly; "a regular
       customer"; "a steady drinker" [syn: regular, steady]
    8: (used of the military) belonging to or engaged in by
       legitimate army forces; "the regular army" [ant: irregular]
    9: (of solids) having clear dimensions that can be measured;
       volume can be determined with a suitable geometric formula
       [ant: irregular]
    10: not constipated [syn: unconstipated, regular] [ant:
        constipated]
    11: symmetrically arranged; "even features"; "regular features";
        "a regular polygon" [syn: even, regular]
    12: not deviating from what is normal; "her regular bedtime"
    13: officially full-time; "regular students"
    n 1: a regular patron; "an habitue of the racetrack"; "a bum who
         is a Central Park fixture" [syn: regular, habitue,
         fixture]
    2: a soldier in the regular army
    3: a dependable follower (especially in party politics); "he is
       one of the party regulars"
    4: a garment size for persons of average height and weight

Moby Thesaurus II by Grady Ward, 1.0:

364 Moby Thesaurus words for "regular":
   Conservative, Democrat, Labourite, OK, Republican, Tory, Whig,
   absolute, acceptable, accepted, accordant, accustomed,
   acknowledged, alike, all-embracing, all-encompassing, all-out,
   all-pervading, annual, approved, armed force, armed service, army,
   arranged, arrant, array, automatic, average, avgas, balanced,
   beaten, bimonthly, biweekly, bona fide, born, bourgeois,
   broad-based, businesslike, career, career soldiers, ceaseless,
   characteristic, chattering, classic, classical, clean, clear,
   client, coequal, common, commonplace, complete, comprehensive,
   conformable, congenital, consistent, consonant, constant,
   consuetudinary, consummate, continual, continuous, conventional,
   coordinate, correct, correspondent, crass, crude, crude oil,
   current, customary, customer, cyclical, daily, decided, deep-dyed,
   definitive, dependable, distinctive, distinguishing, downright,
   downy, dyed-in-the-wool, egregious, equable, equal, equiangular,
   equilateral, established, estimable, ethyl, ethyl gas, eurythmic,
   even, everyday, exemplary, exhaustive, expected, familiar,
   fighting machine, fine, finished, fixed, fixture, flagrant, flat,
   forces, formal, fortnightly, fossil oil, frequent, frequenter,
   garden, garden-variety, gas, gasoline, generally accepted,
   glabrate, glabrescent, glabrous, glaring, good, gross,
   ground forces, ground troops, habitual, habitue, hackneyed,
   harmonious, hebdomadal, heeler, high-octane gas, high-test,
   homogeneous, host, hourly, household, immutable, in hand,
   incessant, intensive, intolerable, invariable, kerosene, kosher,
   lead-free gas, legal, legions, legitimate, leiotrichous, level,
   likeable, low-lead gas, loyalist, machine gun, mark, measured,
   mechanical, methodic, methodical, middle-class,
   military establishment, monolithic, monthly, motor oil, natural,
   naturalistic, no great shakes, normal, normative, obtaining,
   occupation force, of a piece, official, okay, omnibus, omnipresent,
   ordered, orderly, ordinary, orthodox, oscillating, out-and-out,
   outright, paraffin, paratroops, partisan, party faithful,
   party hack, party man, party member, party wheelhorse, patron,
   perennial, perfect, periodic, permanent, perpetual, persistent,
   pervasive, petrol, petroleum, plain, plane, plastic, pleasant,
   plumb, popular, positive, precious, predictable, predominating,
   premium gas, prescribed, prescriptive, prevailing, prevalent,
   profound, pronounced, proper, proportional, proportioned, prospect,
   pulsating, pure, quarterly, quintessential, radical, rank,
   rank and file, ranks, rapid, realistic, received, recognized,
   recurrent, recurring, registered Democrat, registered Republican,
   regular army, regular as clockwork, regular customer, regulars,
   regulation, repeated, repetitive, rhythmical, robotlike, rock oil,
   routine, run-of-mine, run-of-the-mill, sample, scheduled, seasonal,
   set, settled, shattering, sheer, shocking, ski troops, smooth,
   smooth-shaven, smooth-textured, soldiery, stable, staccato,
   stalwart, standard, standing army, stark, stark-staring, steadfast,
   steady, stereotyped, stock, storm troops, straight, stuttering,
   suave, suburban, sucker, superlative, surpassing, sustained,
   sweeping, symmetric, symmetrical, systematic, the line,
   the military, the veriest, thorough, thoroughgoing,
   through-and-through, time-honored, total, traditional, trite,
   troops, true to form, true to type, typal, typic, typical,
   ubiquitous, unalloyed, unbearable, unbroken, unceasing,
   unchangeable, unchanged, unchanging, unconditional, unconscionable,
   undeniable, undeviating, undifferentiated, undistorted,
   undiversified, unequivocal, unexceptional, uniform, unintermitted,
   unintermittent, unintermitting, uninterrupted, universal,
   unmitigated, unnoteworthy, unqualified, unrelieved, unremarkable,
   unremitting, unreserved, unrestricted, unrough, unroughened,
   unruffled, unspectacular, unspoiled, unstopped, unvaried,
   unvarying, usual, utter, veritable, vernacular, vibrating,
   ward heeler, weekly, well-balanced, well-known, well-ordered,
   well-proportioned, well-regulated, well-set, well-set-up,
   well-trodden, well-worn, wheelhorse, wholesale, widespread,
   wonted