Synonym word of once a day:

circadian, common, commonplace, constantly, cyclic, day after day, day by day, day-to-day, diurnal, everyday, from day to day, often, once a day, once daily, ordinary, per diem, periodic, quotidian, regular, regularly, routine


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Synonyms:  A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Popular