éiffeachd
Definitions (by source)
ē-, 1922, 2143, éife-, 6444; validity, 1922, importance, 2143, effect, 6444; -dach, 1718, 2287, 4827, ēiff-, 1792, 6252, éife-, 1806-7, ēife-, 3272; effective, 1718, important, 1792, 1806-7, 2287, 3272, 6252, efficacious, 4827.
Scáthán Shacramuinte na hAithridhe. Editor: Cainneach Ó Maonaigh O.F.M.