adjective

1. conforming in form, build, or arrangement to a rule, principle, type, standard, etc.; orderly; symmetrical regular features
2. characterized by conformity to a fixed principle or procedure
3. 1. usual; customary his regular seat
   2. ☆ not a substitute; established the regular quarterback
   3. ☆ Philately for general, unrestricted use a regular issue of stamps
4. consistent or habitual in action a regular customer
5. recurring at set times or functioning in a normal way a regular pulse
6. conforming to a standard or to a generally accepted rule or mode of conduct; proper
7. properly qualified a regular doctor
8. cubic (sense )
9. Informal thorough; absolute; complete a regular nuisance
10. ☆ Informal pleasant, friendly, reliable, etc. a regular fellow
11. Bot. having all similar parts of the same shape and size; symmetrical: said of flowers
12. Eccles. of a religious institute whose members have vows, specif. solemn vows
13. Gram. conforming to the usual pattern in inflection, formation, etc.; specif., weak ()
14. Math.
    1. having all angles and sides equal, as a polygon
    2. having identical regular polygons for all its faces arranged in the same way around all vertices: said of a polyhedron
    3. uniform with respect to a certain characteristic
15. Mil.
    1. designating or of the permanently constituted, or standing, army of a country
    2. designating soldiers recognized in international law as legitimate combatants in warfare
16. ☆ Politics designating, of, or loyal to the recognized party leadership, candidates, etc.

Etymology: ME reguler < MFr < L regularis, of a bar (in LL, regular) < regula: see rule

noun

1. Eccles. a member of a regular religious institute
2. a member of a regular army
3. ☆ a regular member of an athletic team, not a substitute
4. a clothing size for men of average height
5. Informal one who is regular, as in attendance
6. ☆ Politics a person who is loyal to the recognized party leadership, candidates, etc.