Definition of fifty in English:


Syllabification: fif·ty
Pronunciation: /ˈfiftē

number (plural fifties)

  • 1The number equivalent to the product of five and ten; half of one hundred; 50: only fifty percent of the aircraft were serviceable about fifty of us filed in a fifty-pound salmon (Roman numeral: l or L)
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    • 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
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    • 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
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    • 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: 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 fifty-dollar bill.
    More example sentences
    • Will pulled out a massive wad of notes - fifties - and started betting five times in a row on black, five on red.



Pronunciation: /ˈfiftē-iTH/
More example sentences
  • Last year's broadcast - her fiftieth - was arguably the best.
  • My grandparents married on Christmas Day (quite common in their day) and it was their fiftieth anniversary.
  • So for his fiftieth birthday I organized for him a surprise birthday party with all his closest friends.


Pronunciation: /-ˌfōld/
adjective & adverb
More 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).

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