Lexical Definition

‎ἀντάλλαγμα‎ antállagma (an-tal'-ag-mah) in exchange ^G:N-N
from a compound of ‎ἀντί‎ and ‎ἀλλάσσω‎

in exchange.

• an equivalent or ransom

Abbott-Smith

ἀντ-άλλαγμα, -τος, τό (ἀντί, ἄλλαγμα; < ἀλλάσσω), [in LXX chiefly for מְחִיר;]
an exchange, the price received as an equivalent for an article of commerce: Mt 16:26, Mk 8:37 (cf. Si 26:14; and v. Swete, Mk. 8:37; Cremer, 90).†

Abbott-Smith References

Liddell-Scott-Jones

ἀντάλλαγμα-μα, ατος, τό,

that which is given or taken in exchange, φίλου for a friend, [NT+5th c.BC+]

_{LSJ Scripture Refs: LXX.Job.28.15 ☩ Matt.16.26}