Old Irish aimser

← Proto-Celtic *amsterā (inherited)

← Proto-Indo-European (derived)

← Proto-Indo-European *h₂meh₁- (mention)

← Middle Welsh amser (cognate)

→ Welsh amser (cognate)

→ Irish aimsir (inherited)

→ Scottish Gaelic aimsir (inherited)

→ Manx emshir (inherited)

→ Middle Irish aimser (inherited)

→ Middle Welsh amser (cognate)