overarching UK /ˌəʊvəɹˈɑːtʃɪŋ/US /ˌoʊvəɹˈɑɹt͡ʃɪŋ/adjective 2noun 1forms 3 adjective2 •Arching over; that forms an arch overhead. •(figurative) Dominating or covering something for the most part.Firstly, there needs to be an overarching plan - in the sense that each part of the rail system must be considered together, precisely because it is an integrated network. — 2020 noun1 •A structure that arches over something.But in this case the overarchings do not grow uniformly, but in such a manner that their rims form at least a fissure […] — 1875 formsoverarchings · more overarching · most overarching