proficiency
From LSJ
ἀλλήλων τὰ βάρη βαστάζετε, καὶ οὕτως ἀναπληρώσετε τὸν νόμον τοῦ Χριστοῦ → bear each other's burdens, and in that way fulfill the anointed King's Law (Galatians 6:2)
subs.
Skill: P. and V. ἐπιστήμη, ἡ. Experience: P. and V. ἐμπειρία, ἡ. Progress: P. ἐπίδοσις, ἡ.