Old Irish techt

← Proto-Celtic *tixtā (inherited)

← Proto-Indo-European *steygʰ- (root)

→ Welsh taith (cognate)

→ Irish teacht (inherited)

→ Irish aiteacht (mention)

→ Irish cuideachta (mention)

→ Irish teachta (inherited)

→ Scottish Gaelic cuideachd (mention)

→ Manx çheet (inherited)

→ Latin Tectosages (mention)

→ Middle Irish techt (inherited)

→ Old Irish fortacht (affix)