(music, radio) A radio format for popular music, usually including the 40 most popular songs at a given time.

A penetrating oil used as a lubricant and to protect electric circuits from moisture.

A 419 fraud.

A scam in which the solicitor offers large sums of money in return for a smaller up front investment.

A 419 fraud; any of the various advance-fee frauds in which the scammer solicits up front payments promising large sums of money.

(uncountable) A medical ultrasound technique that produces a sequence of 3D images over time. / (countable) An image so produced.

(athletics) A sprint race over 400 metres.

A class of two-handed double-trapeze dinghy (from its maximum length of 16 feet, approx. 4900 millimetres). / (historical) A miner or other person who took part in the California gold rush of 1849.

plural of 419 scam

plural of 45