lag

1. A gap, a delay; an interval created by something not keeping up; a latency. (countable)
2. Delay; latency. (uncountable)
3. A period of imprisonment. (countable, slang, uncountable)
4. A method of deciding which player is to start. Both players simultaneously strike a cue ball from the baulk line to hit the top cushion and rebound down the table; the player whose ball finishes closest to the baulk cushion wins. (countable, uncountable)
5. One who lags; that which comes in last. (countable, uncountable)
6. The fag-end; the rump; hence, the lowest class. (countable, uncountable)
7. A stave of a cask, drum, etc.; especially (engineering) one of the narrow boards or staves forming the covering of a cylindrical object, such as a boiler, or the cylinder of a carding machine or steam engine. (countable, uncountable)
8. A bird, the greylag. (countable, uncountable)

Plural lags