1 adjective effectiveéifeachtúil adj2 c m uéifeachtach adj1 c m ueffectual measuresbearta éifeachtúla2 adjective LAW validbailí adj3 c m uthe change will be effectual from the first of Maycuirfear an t-athrú i bhfeidhm ón gcéad lá Bealtaine, beidh feidhm leis an athrú ón gcéad lá de Bhealtaine