Welsh amser

← Proto-Celtic *amsterā (inherited)

← Old Welsh amser (inherited)

← Old Irish aimser (cognate)

← Middle Welsh amser (inherited)

→ Breton amzer (cognate)

→ Welsh amserlen (compound)

→ Welsh cyfamser (prefix)

→ Welsh rhan-amser (affix)

→ Welsh llawn-amser (affix)

→ Irish aimsir (cognate)

→ Scottish Gaelic aimsir (cognate)

→ Manx emshir (cognate)