1463, from
break (v.) +
fast (n.). Cf. Fr.
déjeuner "to breakfast," from L.
dis-jejunare "to break the fast." The verb is recorded from 1679. The Sp.
almuerzo "lunch," but formerly and still locally "breakfast," is from L.
admorsus, pp. of
admordere "to bite into," from
ad- "to" +
mordere "to bite." Words for "breakfast" tend over time to shift in meaning toward "lunch;" cf. Fr.
déjeuner "breakfast," later "lunch" (equivalent of Sp.
desayuno "breakfast"), both from V.L.
*disieiunare "to breakfast," from L.
dis- +
ieiunare "fast."