Old Irish acht

← Proto-Celtic *extos (inherited)

← Ancient Greek ἐκτός (cognate)

← Proto-Indo-European *h₁eǵʰsto- (inherited)

← Proto-Indo-European *h₁eǵʰs (mention)

← Latin (mention)

← Latin (mention)

← Old Irish act (alter)

← Old Irish ro- (mention)

→ Irish acht (inherited)

→ Irish ach (inherited)

→ Irish sagartóireacht (suffix)

→ Irish achtaigh (mention)

→ Scottish Gaelic ach (inherited)

→ Ancient Greek ἐκτός (cognate)

→ Manx agh (inherited)

→ Old Irish flaithemnacht (suffix)

→ Old Irish noídenacht (suffix)

→ Old Irish sacerdotalacht (suffix)