Mail which is transported by motor vehicle, by railway, or by seacraft, but not by aircraft.

plural of surface finish

A street that is not a freeway and has at-grade intersections with other surface streets.

plural of surface normal

apparently, outwardly; superficially

(geometry) A ruled surface whose rulings are all parallel to a fixed plane.

plural of Catalan surface

Superficiality. / The belief that only surfaces are suitable for landing or docking. / (grammar) In transformational grammar, the belief that deep and surface structures are similar.

plural of surface etymology

(linguistics) The apparent etymology of a term based on components occurring in the modern form of the language, such as earth + -en for earthen, which actually occurred in Old English as eorthene.