1. Customary, usual, or normal: the train's regular schedule.

2. Orderly, even, or symmetrical: regular teeth.

3. In conformity with a fixed procedure, principle, or discipline.

4. Well-ordered; methodical: regular habits.

5. Occurring at fixed intervals; periodic: regular payments.

6. Having bowel movements or menstrual periods with normal frequency.

7. Not varying; constant.

8. Formally correct; proper.

9. Having the required qualifications for an occupation: not a regular lawyer.

10. Informal Complete; thorough: a regular scoundrel.

11. Informal Good; nice: a regular guy.

12. Botany Having symmetrically arranged parts of similar size and shape: regular flowers.

13. Grammar Conforming to the usual pattern of inflection, derivation, or word formation.

14. Ecclesiastical Belonging to a religious order and bound by its rules: the regular clergy.

15. Mathematics

a. Having equal sides and equal angles. Used of polygons.

b. Having faces that are congruent regular polygons and congruent polyhedral angles. Used of polyhedrons.

16. Belonging to or constituting the permanent army of a nation.