incidental.1a.a(Eachtra, ceol) teagmhasach. Incidental expenses, fochostais mpl. Incidental clause, clásal teagmhasach. bIncidental to sth., a ghabhann le rud. 2s.Teagmhas m; forud m -a. ►incidentally, adv.1Go teagmhasach. 2Be it said incidentally, dála an scéil.