A detective of the United States government.

A place of employment in which a union receives dues or the equivalent for all employees excluding management, and bargains for all such employees whether or not they are members of the union.

(medicine) Synonym of contrast medium

(aviation, travel) An official notification that a travel agency has underpaid an airline for a ticket or similar, or is being fined by the airline for failure to adhere to fare rules or airline policy.

(aviation, travel) an official notification that a travel agency has overpaid an airline for a ticket or similar travel arrangements.

(Scotland, dialect, archaic) Aside, on or to one side; awry; off from the straight line.

(now rare) Someone acting as the representative of an organisation, country etc.

Capable of being aged; suitable for ageing. / (dialect, informal, dated) Getting on in years; fairly old.

A spy who is placed in a target country or organisation, not to undertake an immediate mission, but rather to act as a potential asset if activated.

(formal) An email client or email reader.