regular
noun
a regular patron
“an habitue of the racetrack”
“a bum who is a Central Park fixture”
a soldier in the regular army
a dependable follower (especially in party politics)
“he is one of the party regulars”
a garment size for persons of average height and weight
adjective
in accordance with fixed order or procedure or principle
“his regular calls on his customers”
“regular meals”
Oppositesirregularoften used as intensifiers
“a regular morass of details”
“a regular nincompoop”
Synonymsveritableconforming to a standard or pattern
“following the regular procedure of the legislature”
“a regular electrical outlet”
regularly scheduled for fixed times
“at a regular meeting of the PTA”
“regular bus departures”
in accord with regular practice or procedure
“took his regular morning walk”
“her regular bedtime”
occurring at fixed intervals
“a regular beat”
“the even rhythm of his breathing”
Synonymsevenrelating to a person who does something regularly
“a regular customer”
“a steady drinker”
Synonymssteady(used of the military) belonging to or engaged in by legitimate army forces
“the regular army”
Oppositesirregular(of solids) having clear dimensions that can be measured; volume can be determined with a suitable geometric formula
Oppositesirregularnot constipated
Synonymsunconstipatedsymmetrically arranged
“even features”
“regular features”
Synonymsevennot deviating from what is normal
“her regular bedtime”
officially full-time
“regular students”
Source: WordNet 3.1, Princeton University