Definitions of regular:

• noun:   a garment size for persons of average height and weight
• noun:   a regular patron
• noun:   a dependable follower (especially in party politics)

  Example: "He is one of the party regulars"

• noun:   a soldier in the regular army
• adjective:   not deviating from what is normal

  Example: "Her regular bedtime"

• adjective:   in accordance with fixed order or procedure or principle

  Example: "His regular calls on his customers"

• adjective:   (of solids) having clear dimensions that can be measured; volume can be determined with a suitable geometric formula
• adjective:   (used of the military) belonging to or engaged in by legitimate army forces

  Example: "The regular army"

• adjective:   conforming to a standard or pattern

  Example: "Following the regular procedure of the legislature"

• adjective:   regularly scheduled for fixed times

  Example: "At a regular meeting of the PTA"

• adjective:   in accord with regular practice or procedure

  Example: "Took his regular morning walk"

• adjective:   relating to a person who does something regularly

  Example: "A regular customer"

• adjective:   officially full-time

  Example: "Regular students"

• adjective:   occurring at fixed intervals

  Example: "A regular beat"

• adjective:   symmetrically arranged

  Example: "Regular features"

• adjective:   not constipated