(historical) A duel between single representatives of opposing armies, with the outcome accepted as the battle's outcome.

Having one strand

Used to ask whether the interlocutor does or doesn't have a (romantic) partner.

(music) The first single released from an album

(metalworking, manufacturing) A three-dimensional shape into which a thin flat sheet of material, e.g. metal, can be formed by bending alone, without stretching or compression.

A room that has one single bed.

Having an honest heart; straightforward, free from duplicity. / Devoted; unambivalent and dedicated.

plural of single room

plural of single ticket

(engineering) Having simplicity of action; especially acting or exerting force during strokes in one direction only; said of a reciprocating engine, pump, etc.