G0208
ἀκυρόω
to nullify
ἀκυρόω, -ῶ (κῦρος, authority), [in LXX: 1Es.6:32 Est.6:1-34, 2Ma.6:1-31 * ;] to revoke, invalidate (MM, VGT, see word): Mat.15:6, Mrk.7:13, Gal.3:17 (Plut.).† (AS)
Full Thayer's lexicon entry
ἀκυρόω — akyróō
ἀκυρόω, (ῶ, 1 aorist ἠκύρωσα; (ἄκυρος without authority, not binding, void; from κῦρος force, authority), to render void, deprive of force and authority, (opposed to κυρόω to confirm, make valid): ἐντολήν, Mat 15:6 (R G; νόμον, ibid. T WH marginal reading); λόγον (Mat 15:6 L Tr WH text); Mar 7:13 (cf. ἀθετέω); διαθήκην, Gal 3:17. ((1Es 6:31); Diodorus, Dionysius Halicarnassus, Plutarch.)
3 occurrences
Matthew (1), Mark (1), Galatians (1)