Allerretour

Allerretour, commonly written aller-retour, is a French term for a round-trip journey or ticket. It denotes travel from a starting point to a destination and back again, as opposed to a one-way trip (aller simple).

Etymology and spelling: the term combines aller (to go) and retour (return). The preferred spelling in standard French is aller-retour with a hyphen; some texts or branding drop the hyphen or render it as a single word (allerretour), though that form is nonstandard.

Usage: It is widely used in transport contexts, especially in rail and air travel. A ticket labeled billet aller-retour covers both the outbound and return journey and is priced accordingly. In many Francophone countries, train and airline tickets are sold as aller-retour or aller retour. The term is also used metaphorically to describe any plan involving a round trip.

Related terms include aller simple (one-way) and retour (return). In English, round trip or return ticket are common equivalents.