extra ( extras plural )
1 adj You use extra to describe an amount, person, or thing that is added to others of the same kind, or that can be added to others of the same kind.
Police warned motorists to allow extra time to get to work..., Extra staff have been taken on to cover busy periods..., There's an extra blanket in the bottom drawer of the cupboard.
2 adj If something is extra, you have to pay more money for it in addition to what you are already paying for something.
The price of your meal is extra.
Extra is also a pronoun., pron
Many of the additional features now cost extra...
Extra is also an adverb., adv
You may be charged 10% extra for this service.
3 n-count Extras are additional amounts of money that are added to the price that you have to pay for something.
There are no hidden extras.
4 n-count Extras are things which are not necessary in a situation, activity, or object, but which make it more comfortable, useful, or enjoyable.
Optional extras include cooking tuition at a top restaurant...
5 n-count The extras in a film are the people who play unimportant parts, for example as members of a crowd.
6 adv You can use extra in front of adjectives and adverbs to emphasize the quality that they are describing.
INFORMAL ADV adj/adv (emphasis)
I'd have to be extra careful..., What makes a magnificent garden extra special?...
to go the extra mile →
extra- is used to form adjectives indicating that something is outside something or is not part of it.
The move was extra-constitutional..., They competed for power through a combination of parliamentary and extra-parliamentary methods..., The report says torture was widespread, as were extra-judicial executions by government troops.
extra-marital , extramarital
An extra-marital affair is a sexual relationship between a married person and another person who is not their husband or wife. adj usu ADJ n
Her husband has admitted having an extra-marital affair.
extra-mural , extramural
Extra-mural courses are courses at a college or university which are taken mainly by part-time students. adj usu ADJ n
extra-sensory perception , extrasensory perception
Extra-sensory perception means knowing without using your ordinary senses such as sight and hearing. Some people believe this is possible. The abbreviation ESP is also used. n-uncount
If a game of football, hockey, or basketball goes into extra time, the game continues for a set period after it would usually have ended because both teams have the same score.
Cambridge won 2-0 after extra time.
in AM, use overtime