Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
σιτίων with food LXX.Prov.30.22
σιτία grain Acts.7.12

Liddell-Scott-Jones

σιτίον (sition) food G:N-N

σιτίον-ίον, τό,

mostly in plural σιτία (singular in [Refs 5th c.BC+], and later Prose, as [Refs 1st c.AD+]; only used in Prose and Comedy:

__I grain, corn, ἤλουν ὄρθριαι τὰ σ. [Refs 5th c.BC+]
__II food made from grain, bread, τούτοισι δὲ (i.e. ὀσπρίοισι) μὴ χρῆσθαι εἰ μὴ μετὰ σιτίων [Refs 5th c.BC+]; ἀπὸ ὀλυρέων ποιεῦνται σιτία make bread from spelt, [Refs 5th c.BC+]
__II.2 generally, victuals, provisions for men, opposed to χόρτος (fodder for cattle), [Refs]; σιτί᾽ ἡμερῶν τριῶν three days' provision, of soldiers, [Refs 5th c.BC+]; σ. καὶ ποτά food and drink, [Refs 5th c.BC+]: so in singular, [Refs 5th c.BC+]; opposed to ῥύφημα, [Refs 5th c.BC+]
__II.3 τἀν Πρυτανείῳ σ. public maintenance in the Prytaneum, [Refs 5th c.BC+]
__II.4 rarely, food for dogs, [Refs 5th c.BC+]
__III faces, [Refs 5th c.BC+]