Lexical Definition

‎ἀριστάω‎ aristáō (ar-is-tah'-o) to eat early meal G:V
from ‎ἄριστον‎

dine.

Usage: 5 forms in 5 verses
Form Translated As     In Verse(s)
ἠρίστησαν they had dined John.21.15
ἀριστήσῃ He would dine Luke.11.37
ἀριστήσατε do have breakfast John.21.12
αριστάν to dine LXX.Gen.43.25
αρίστησον dine LXX.1Kgs.13.7

Abbott-Smith

ἀριστάω, -ῶ (< ἄριστον), [in LXX: Ge 43:25 (לֶחֶם אָכַל), I Ki 14:24 (לחם), III Ki 13:7 (סעד), To 2:1*;]
1. prop., to breakfast: Jo 21:12, 15.
2. In late Gk., to take a meal, dine: Lk 11:37.†

Abbott-Smith References

Book Refs
Genesis 43:25
1 Samuel 14:24
1 Kings 13:7
Luke 11:37
John 21:12 · 21:15

Liddell-Scott-Jones

ἀριστάω,

infinitive ἀριστᾶν, Ionic dialect -ῆν[Refs 5th c.BC+]: perfect ἠρίστηκα[Refs 5th c.BC+]; of this tense the Comedy texts also used I plural ἠρίσταμεν[Refs 5th c.BC+], infinitive ἠριστάναι[Refs 5th c.BC+] — passive, perfect ἠρίστημαι, see below [ᾱρ [Refs 5th c.BC+]; ᾰρ only late, [Refs 6th c.AD+]]:—take the ἄριστον or midday meal, [Refs 5th c.BC+]; ἠρίστων, opposed to ἐδείπνουν, [Refs 5th c.BC+]: with accusative of things, breakfast on, ἴα καὶ ῥόδα[Refs 5th c.BC+]: perfect passive impersonal, ἠρίστηται δ᾽ ἐξαρκούντως[Refs 5th c.BC+]

__2 eat a second meal, opposed to μονοσιτέω, [Refs 5th c.BC+]