An agreement between an employer and a union such that the union will represent all the workers at a particular workplace.

A voting system where each voter lists the candidates in order of preference and there is provision to transfer the votes of the less popular candidates and a proportion of the votes of candidates who are elected with more than a certain quota.

Whisky made only from the malted barley of a single distillery, unblended with other whiskies.

(mathematics) Any function in which each point in the domain maps to just one point in the range

A nuclear family with only one parent.

(sports) A tournament where the loser of a game or match is eliminated from further competition.

plural of single-parent family

(astronomy) A star system consisting of a solitary star not gravitationally bound to other stars

plural of single star system

(roofing) Roofing membranes that are field applied using just one layer of membrane material (either homogeneous or composite rather than multiple layers.