Lexical Definition

‎ἐλάχιστος‎ eláchistos (el-akh'-is-tos) least ^G:A--S
superlative of (short)

least, very little (small), smallest.

• used as equivalent to ‎μικρός‎
• least (in size, amount, dignity, etc.)

Abbott-Smith

ἐλάχιστος, -η, -ον (v.s. ἐλάσσων),
smallest, least: as proper superlat., I Co 15:9; elsewhere, as usually in late Gk., intensive (B1., § 11, 3); Mt 2:6 (LXX) 25:40, 45, Lk 12:26 16:10 19:17, I Co 4:3 6:2, Ja 3:4; ἐ. ἐν τ. βασιλείᾳ τ. οὐρανῶν, Mt 5:19 (v. Dalman, Words, 113). Compar., ἐλαχιστότερος (for corresp. superl., v. LS; v. also Bl., § 44, 3); less than the least: Eph 3:8.†

Abbott-Smith References

Liddell-Scott-Jones

ἐλάχιστος-ος [ᾰ], η, ον,

superlative of ἐλαχύς: comparative ἐλάσσων (which see):— smallest, least, frequently with a negative, γέρας, δύναμις οὐκ ἐ., [Refs 5th c.BC+]; λόγου ἐλαχίστου of least account, [Refs]; ἐλαχίστου ἐδέησε διαφθεῖραι narrowly missed destroying them, [Refs 5th c.BC+]

__2 of Time, shortest, δι᾽ ἐλαχίστου (i.e. χρόνου) [Refs 5th c.BC+]; δι᾽ ἐλαχίστης βουλῆς with shortest deliberation, [Refs]
__3 of Number, fewest, [Refs 5th c.BC+]; ἐν ἐλαχίστοις δυσίν between two at least. [Refs]
__4 in Mathematics texts, ἐλάχιστα καὶ μέγιστα minima and maxima, [Refs 3rd c.BC+]
__II τὸ ἐλάχιστον, τοὐλάχιστον, at the least, [Refs 5th c.BC+]; ἐλάχιστα least of any one, [Refs 5th c.BC+]; ὡς ἐ. as little as possible, [Refs 5th c.BC+]
__III from ἐλάχιστος came a new comparative ἐλαχιστότερος less than the least, ἐ. πάντων ἁγίων [NT] very least of all, [Refs 2nd c.AD+]

_{LSJ Scripture Refs: Eph.3.8}