Definition of fifty in English:

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Pronunciation: /ˈfɪfti/

cardinal number (plural fifties)

1The number equivalent to the product of five and ten; half of one hundred; 50: only fifty per cent of the aircraft were serviceable about fifty of us filed in a fifty-pound salmon (Roman numeral: l or L)
More example sentences
  • Five rooms at Clarence House will be open to the public this year between August 4 and October 17 (at a cost of five pounds and fifty pence).
  • If all you have on arrival is the equivalent of fifty pound notes, try asking a change bureau at your holiday destination airport to break a note down for you.
  • Agents say that they sending back over fifty percent of some deliveries because their products don't sell very well.
1.1 (fifties) The numbers from 50 to 59, especially the years of a century or of a person’s life: Elvis is the icon of the Fifties
More example sentences
  • Stephen who was in his middle fifties was working on a television aerial in the Aghamore area fell from the roof of a two storey house, he was rushed to Castlebar hospital but died a short time later.
  • And by then, it's too late to retool - the opportunity costs of going back to school in your fifties are huge.
  • Very few men in their forties caught my eye but once in the fifties, they aged rapidly in comparison to their female counterparts.
1.2Fifty years old: she looked about fifty
More example sentences
  • Their ages range between fifty to eighty-three.
  • By the age of fifty, most of us are haunted by ghosts.
  • The dread didn't sink in until I realised I was probably the youngest person in the theatre, with the mean age being about fifty.
1.3Fifty miles an hour: I was doing about fifty
More example sentences
  • From the corner came her sister's red jeep probably going about fifty miles an hour.
  • The planes only had a top speed of fifty miles per hour and when hitting strong headwinds actually began to move backwards in mid-air.
  • He estimated that his top running speed is about fifty miles per hour.
1.4A size of garment or other merchandise denoted by fifty.
1.5A fifty-pound note or fifty-dollar bill.
Example sentences
  • Will pulled out a massive wad of notes - fifties - and started betting five times in a row on black, five on red.



adjective& adverb
Example sentences
  • Corporate data grows fiftyfold in three years.
  • The Managing director of Iran's Blood Transfusion Organization announced on Tuesday that blood donations have increased fiftyfold during the past year.


Old English fīftig (see five, -ty2).

Words that rhyme with fifty

fifty-fifty, nifty, shifty, swiftie, thrifty

For editors and proofreaders

Line breaks: fifty

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