usual; normal; customary: to put something in its regular place.
evenly or uniformly arranged; symmetrical: regular teeth.
characterized by fixed principle, uniform procedure, etc.: regular income.
recurring at fixed times; periodic: regular bus departures; regular meals.
rhythmical: regular breathing.
occurring with normal frequency, as menses or bowel movements.
having regular menses or bowel movements.
adhering to a rule or procedure; methodical: regular habits; to be regular in one's diet.
observing fixed times or habits; habitual: a regular customer.
orderly; well-ordered: a regular life.
conforming to some accepted rule, discipline, etc.
carried out in accordance with an accepted principle or rule; formally correct: a regular session of the court.
qualified to engage in an occupation or profession; legitimate; proper: I suspected the man wasn't a regular doctor.
real or genuine; down-to-earth; decent: a regular guy.
absolute; thoroughgoing: a regular rascal.
(of a flower) having the members of each of its floral circles or whorls alike in form and size.
Grammar. conforming to the most prevalent pattern of formation, inflection, construction, etc.
governed by one law throughout.
(of a polygon) having all sides and angles equal.
(of a polyhedron) having all faces congruent regular polygons, and all solid angles congruent.
(of a topological space) having the property that, corresponding to each point and a closed set not containing the point, there are two disjoint open sets, one containing the point, the other containing the closed set.
(of a function of a complex variable) analytic ( def 5a ).
Military. noting or belonging to the permanently organized, or standing, army of a state.
International Law. noting soldiers recognized as legitimate combatants in warfare.
Ecclesiastical. subject to a religious rule, or belonging to a religious or monastic order (opposed to secular ): regular clergy.
U.S. politics. of, pertaining to, or selected by the recognized agents of a political party: the regular ticket.
(of coffee) containing an average amount of milk or cream.
a long-standing or habitual customer or client: The restaurant can always find tables for its regulars.
Ecclesiastical. a member of a duly constituted religious order under a rule.
Military. a professional soldier.
U.S. Politics. a party member who faithfully stands by his or her party.
a size of garment designed for men of average build.
a garment, as a suit or overcoat, in this size.
an athlete who plays in most of the games, usually from the start.

1350–1400; Middle English reguler (adj.) < Middle French < Late Latin rēgulāris. See regula, -ar1

regularity [reg-yuh-lar-i-tee] , regularness, noun
quasi-regular, adjective
quasi-regularly, adverb
subregular, adjective
subregularity, noun

regular, routine.

2. even, formal, orderly, uniform. 4. habitual, established, fixed. 8. systematic. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
regular (ˈrɛɡjʊlə)
1.  normal, customary, or usual
2.  according to a uniform principle, arrangement, or order: trees planted at regular intervals
3.  occurring at fixed or prearranged intervals: to make a regular call on a customer
4.  following a set rule or normal practice; methodical or orderly
5.  symmetrical in appearance or form; even: regular features
6.  (prenominal) organized, elected, conducted, etc, in a proper or officially prescribed manner
7.  (prenominal) officially qualified or recognized: he's not a regular doctor
8.  (prenominal) (intensifier): a regular fool
9.  informal (US), (Canadian) likable, dependable, or nice (esp in the phrase a regular guy)
10.  denoting or relating to the personnel or units of the permanent military services: a regular soldier; the regular army
11.  (of flowers) having any of their parts, esp petals, alike in size, shape, arrangement, etc; symmetrical
12.  (of the formation, inflections, etc, of a word) following the usual pattern of formation in a language
13.  maths
 a.  (of a polygon) equilateral and equiangular
 b.  (of a polyhedron) having identical regular polygons as faces that make identical angles with each other
 c.  (of a prism) having regular polygons as bases
 d.  (of a pyramid) having a regular polygon as a base and the altitude passing through the centre of the base
 e.  another name for analytic
14.  botany another word for actinomorphic
15.  (postpositive) subject to the rule of an established religious order or community: canons regular
16.  (US) politics of, selected by, or loyal to the leadership or platform of a political party: a regular candidate; regular policies
17.  crystallog another word for cubic
18.  a professional long-term serviceman or -woman in a military unit
19.  informal a person who does something regularly, such as attending a theatre or patronizing a shop
20.  a member of a religious order or congregation, as contrasted with a secular
21.  (US) politics a party member loyal to the leadership, organization, platform, etc, of his or her party
[C14: from Old French reguler, from Latin rēgulāris of a bar of wood or metal, from rēgula ruler, model]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. reguler, from L.L. regularis "continuing rules for guidance," from L. regula "rule," from PIE *reg- "move in a straight line" (see regent). Earliest sense was of religious orders (the opposite of secular). Extended 16c. to shapes, etc., that followed
predictable or uniform patterns; sense of "normal" is from 1630s; meaning "real, genuine" is from 1821. Meaning "a regular customer" is recorded from 1852.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
regular   (rěg'yə-lər)  Pronunciation Key 
Having all sides or faces equal. For example, a square is a regular polygon, and a cube is a regular polyhedron.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Meanwhile, new reports keep coming along with alarming regularity, highlighting
  the dangers of these unregulated chemicals.
Nor does any scientist conduct science on the premise that there is no order,
  regularity, structure or design in nature.
The suggested regularity or seasonality of one and possibly of another that
  failed early due to fire damage is not conclusive.
Look at the rest of the world, where violence has more or less become a
  regularity in people's lives.
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