(UK) A commissioned officer of the Royal Navy ranking above a midshipman and below a lieutenant.

(countable) A written or pictorial false statement which unjustly seeks to damage someone's reputation. / (uncountable) The act or tort of displaying such a statement publicly.

To defame (someone), especially in a manner that meets the legal definition of libel. / To proceed against (goods, a ship, etc.) by filing a libel claim.

(sports) A line marking the end of a race. / (figuratively, by extension) The end of a process.

A firefly.

Alternative spelling of lifetime

The amount of light falling on a given area, as measured by units such as the lumen.

an article of protective clothing that is designed to keep the wearer's head floating above the surface of the water.

(physics) The speed of electromagnetic radiation; in a perfect vacuum it is defined as 299,792,458 metres per second / (colloquial, figuratively) A very rapid speed.

A restriction; a bound beyond which one may not go.