G0712
ἄριστον
early meal
ἄριστον, -ου, τό [in LXX: 3Ki.3:1 (לֶחֶם), Tob.2:1, 4, al. ;] __1 1, prop., breakfast. __2. In late Gk. = cl. δεῖτνον, dinner: Mat.22:4, Luk.11:38 14:12.† (AS)
Full Thayer's lexicon entry
ἄριστον — áriston
ἄριστον, ἀρίστου, τό (from Homer down);
a. the first food, taken early in the morning before work, breakfast; dinner was called δεῖπνον. But the later Greeks called breakfast; τό ἀκράτισμα, and dinner ἄριστον i. e. δεῖπνον μεσηβρινον, Athen. 1, 9, 10, p. 11b.; and so in the N. T. Hence,
b. dinner: Luk 14:12 (ποιεῖν ἄριστον ἤ δεῖπνον, to which others are invited); Luk 11:38; Mat 22:4 (ἑτοιμάζειν). (B. D. under the word; Becker's Charicles, namely, vi. excurs. i. (English translation, p. 312f).)
3 occurrences
Matthew (1), Luke (2)