Lexical Definition

‎ἐπιούσιος‎ epioúsios (ep-ee-oo'-see-os) daily G:A
perhaps from the same as ‎ἐπιοῦσα‎

daily.

Usage: 1 form in 2 verses
Form Translated As     In Verse(s)
ἐπιούσιον daily Matt.6.11Luke.11.3

Abbott-Smith

*† ἐπιούσιος, -ον (cf. περιούσιος, [in LXX for סְגֻלָּה, De 7:6, etc.]),
found only in the phrase ἄρτος ἐ., EV, daily; R, mg., for the coming day: Mt 6:11, Lk 11:3. (Several derivations find support, each pointing to a different meaning.
1. < ἐπιοῦσα (sc. ἡμέρα) (or, < ἐπὶ τὴν ἰοῦσαν (sc. ήμέραν), Zorell, s.v.), hence, for the morrow or for the coming day (R, mg.).
2.
(a) < ἐπί + οὐσία, hence, for subsistence, needful (Am. R, mg.);
(b) < ἐπί + εἶναι in fem. ptcp. form, hence, pertaining to (the day). For renderings of versions and views of various writers, v. reff. in DB, ext., 36 f.; DCG, ii, 58 f., 62a; ICC on Lk, l.c. The EV, daily, is based on the Vg. (Lk; OL, Mt, Lk, quotidianus). "It is difficult not to think that τὸν ἐ. rests upon misunderstanding of an original Aramaic phrase, or upon a Greek corruption" (ICC on Mt, l.c.; cf. also Cremer, 239).†

Abbott-Smith References

Book Refs
Deuteronomy 7:6
Matthew 6:11
Luke 11:3

Liddell-Scott-Jones

ἐπιούσιος, ον,

either, sufficient for the coming (and so current) day, (ἐπιοῦσα (i.e. ἡμέρα)), or, for the day (ἐπὶ τὴν οὖσαν (i.e. ἡμέραν)), ἄρτος NT.Matt.6.11 [NT]; τὰ . uncertain meaning [Refs]

LSJ Scripture Refs: Matt.6.11Luke.11.3