PERIODICAL Copy link • PERIODICAL 1. adj.., Recurring at intervals, certo tempore recurrens: periodical diseases, morbi accidentes et remittentes; morbi certo tempore recurrentes: periodical winds, etesiae (plur., of the winds that blew in the Mediterranean, etc., in the dog-days); verti, qui certo tempore in aliquo loco flare consueverunt or qui certo tempore ex aliqua caeli parte spirant (☞ Caes., B.G., 5, 7; Gell., 2, 2, extr.). Periodical writings or works, perhaps ephemerides. Constructed in periods, compositus; circumscriptus: numerose et apte cadens: a periodical style, oratio structa, apta, vincta (opposed to oratio soluta or dissipata); verborum apta et quasi rotunda constructio; circumscriptus verborum ambitus (Cic.). 2. s. *ephemeris, *plagula ephemeridum, actorum diurnorum (daily): *libellus hebdomadalis (weekly): *libellus menstruus (monthly): libellus trimestris (quarterly).