adjective
(Christianity) Bound by religious rule; belonging to a monastic or religious order (often as opposed to secular).
Having a constant pattern; showing evenness of form or appearance.
(geometry, of a polygon) Both equilateral and equiangular; having all sides of the same length, and all (corresponding) angles of the same size
(geometry, of a polyhedron) Whose faces are all congruent regular polygons, equally inclined to each other.
Demonstrating a consistent set of rules; showing order, evenness of operation or occurrence.
(astronomy) Of a moon or other satellite: following a relatively close and prograde orbit with little inclination or eccentricity.
(now rare) Well-behaved, orderly; restrained (of a lifestyle etc.).
Happening at constant (especially short) intervals.
(grammar, of a verb, plural, etc) Following a set or common pattern; according to the normal rules of a given language.
(chiefly US) Having the expected characteristics or appearances; normal, ordinary, standard.
(chiefly military) Permanently organised; being part of a set professional body of troops.
Having bowel movements or menstrual periods at constant intervals in the expected way.
(colloquial) Exemplary; excellent example of; utter, downright.
(botany, zoology) Having all the parts of the same kind alike in size and shape.
(crystallography) Isometric.
(snowboarding) Riding with the left foot forward.
(mathematical analysis, not comparable, of a Borel measure) Such that every set in its domain is both outer regular and inner regular.
(commutative algebra, not comparable, of a local ring) Noetherian and such that the minimal number of generators of the maximal ideal is equal to the Krull dimension of the ring.
(algebraic geometry, not comparable, of a scheme) Such that the local ring at every point is regular.
(obsolete, not comparable, of a ring) A von Neumann regular: such that every left module (over the given ring) is flat.
adverb
(archaic, dialect, nonstandard) Regularly, on a regular basis.
noun
A member of the British Army (as opposed to a member of the Territorial Army or Reserve).
A frequent, routine visitor to an establishment.
A member of the armed forces or police force.
A frequent customer, client or business partner.
(television) A character who appears in every episode of a TV series; a member of the regular cast.
(Canada) A coffee with one cream and one sugar.
Anything that is normal or standard.
A member of a religious order who has taken the three ordinary vows.
A number for each year, giving, added to the concurrents, the number of the day of the week on which the Paschal full moon falls.
A fixed number for each month serving to ascertain the day of the week, or the age of the moon, on the first day of any month.