regular synonyms

conventional customary

even general expected natural normal annual daily formal fixed usual constant arranged measured routine consistent steady precise uniform weekly organized frequent automatic rational exact monthly mechanical successive systematic anticipated probable serial seasonal regulated recurrent quarterly orderly alternate rhythmic yearly patterned symmetrical momentary alternating hourly harmonious habitual cyclic consonant cyclical methodical menstrual rotational diurnal invariable punctual quotidian accordant congruous semiannual in order periodic classified unconfused tertian quartan hebdomadal