Lexical Definition

‎μεταλλάσσω‎ metallássō (met-al-las'-so) to exchange ^G:V
from ‎μετά‎ and ‎ἀλλάσσω‎

change.

• to exchange

Abbott-Smith

μετ-αλλάσσω, [in LXX: Es 2:7 (מוּת), Es 2:20, I Es 1:31, II Mac9*;]
1. to exchange: τ. ἀλήθειαν . . . ἐν τ. ψεύδει, the truth for a lie (v. Bl., § 36, 8), Ro 1:25.
2. to change: c. acc. seq. εἰς, Ro 1:26 (ἀλλάσσω).†

Abbott-Smith References

Liddell-Scott-Jones

μεταλλάσσω,

Attic dialect μεταλλάττω, perfect μετήλλᾰχα and irregular μετήλλᾰγα (see. below):—passive, irregular aorist 2 infinitive μεταλλάγειν [Refs 2nd c.BC+]:—change, alter, θέσμια [Refs 5th c.BC+]; πότμος.. μ. φύσιν[NT+5th c.BC+]; τὰς τύχας ἑκατέρων μετήλλαξαν interchanged them, [Refs 5th c.BC+]

__II exchange,
__II.1 take in exchange, adopt, assume, ὀρνίθων μεταλλάξας φύσιν [Refs 5th c.BC+]; μ. τόπον go into a new country, [Refs 5th c.BC+]; μ. διάφορα βρώματα to have varieties of food, [Refs 4th c.BC+]:— middle, μεταλλάσσεσθαι χιτῶνα [Refs 5th c.BC+]
__II.2 exchange by leaving, quit, μ. τὸν βίον [Refs 5th c.BC+]; τὸ ζῆν μ. νόσῳ [Refs 5th c.BC+]; οἱ μετηλλαχότες the dead, [Refs 5th c.BC+]; Doric dialect μεταλλαχώς [Refs]; μεταλλαγότων (sic) [Refs 4th c.BC+]
__III intransitive, undergo a change, change, [Refs 5th c.BC+] M.: with genitive, change from, [Refs 5th c.BC+]
__IV substitute, transfer, τινὰς εἰς τήν τινων χώραν [Refs 5th c.BC+]

_{LSJ Scripture Refs: Rom.1.25}