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Once vs While - What's the difference?

once | while |

As conjunctions the difference between once and while

is that once is as soon as; when; after while while is during the same time that.

As an adverb once

is one and only one time.

As a noun while is

an uncertain duration of time, a period of time.

As a verb while is

to pass (time) idly.

once

English

(wikipedia once)

Adverb

(-)
  • (lb) One and only one time.
  • :
  • (lb) Formerly; during some period in the past.
  • :
  • *
  • *:Orion hit a rabbit once ; but though sore wounded it got to the bury, and, struggling in, the arrow caught the side of the hole and was drawn out. Indeed, a nail filed sharp is not of much avail as an arrowhead; you must have it barbed, and that was a little beyond our skill. Ikey the blacksmith had forged us a spearhead after a sketch from a picture of a Greek warrior; and a rake-handle served as a shaft.
  • *{{quote-book, year=1944, author=(w)
  • , title= The Three Corpse Trick, chapter=5 , passage=The hovel stood in the centre of what had once been a vegetable garden, but was now a patch of rank weeds. Surrounding this, almost like a zareba, was an irregular ring of gorse and brambles, an unclaimed vestige of the original common.}}
  • *{{quote-magazine, date=2013-06-14, author=(Jonathan Freedland)
  • , volume=189, issue=1, page=18, magazine=(The Guardian Weekly) , title= Obama's once hip brand is now tainted , passage=Now we are liberal with our innermost secrets, spraying them into the public ether with a generosity our forebears could not have imagined. Where we once sent love letters in a sealed envelope, or stuck photographs of our children in a family album, now such private material is despatched to servers and clouds operated by people we don't know and will never meet.}}
  • (lb) Multiplied by one: indicating that a number is multiplied by one.
  • :
  • As soon as.
  • *{{quote-magazine, date=2013-06-07, author= Ed Pilkington
  • , volume=188, issue=26, page=6, magazine=(The Guardian Weekly) , title= ‘Killer robots’ should be banned in advance, UN told , passage=In his submission to the UN, [Christof] Heyns points to the experience of drones. Unmanned aerial vehicles were intended initially only for surveillance, and their use for offensive purposes was prohibited, yet once strategists realised their perceived advantages as a means of carrying out targeted killings, all objections were swept out of the way.}}

    Coordinate terms

    * (one time) twice, thrice, often, never, seldom * (formerly) yesterday, tomorrow

    See also

    * once again, once more * once and for all * once in a blue moon * once in a while * once removed * once upon a time

    Conjunction

    (English Conjunctions)
  • As soon as; when; after.
  • We'll get a move on once we find the damn car keys!
    Once you have obtained the elven bow, return to the troll bridge and trade it for the sleeping potion.
    Once he is married, he will be able to claim the inheritance.
  • * {{quote-news, year=2011
  • , date=September 27 , author=Alistair Magowan , title=Bayern Munich 2 - 0 Man City , work=BBC Sport citation , page= , passage=Not only were Jupp Heynckes' team pacey in attack but they were relentless in their pursuit of the ball once they had lost it, and as the game wore on they merely increased their dominance as City wilted in the Allianz Arena.}}

    Statistics

    *

    while

    English

    Noun

    (en noun)
  • An uncertain duration of time, a period of time.
  • He lectured for quite a long while .

    Conjunction

    (wikipedia while) (English Conjunctions)
  • During the same time that.
  • * , chapter=12
  • , title= Mr. Pratt's Patients , passage=While the powwow was going on the big woman came back again. She was consider'ble rumpled and scratched up, but there was fire in her eye.}}
  • * 1948 , , North from Mexico / The Spanish-Speaking People of The United States , J. B. Lippincott Company, page 25,
  • While De Anza was exploring the Bay of San Francisco, seeking a site for the presidio, the American colonists on the eastern seaboard, three thousand miles away, were celebrating the signing of the Declaration of Independence.
  • * {{quote-magazine, date=2013-06-07, author=David Simpson
  • , volume=188, issue=26, page=36, magazine=(The Guardian Weekly) , title= Fantasy of navigation , passage=Like most human activities, ballooning has sponsored heroes and hucksters and a good deal in between. For every dedicated scientist patiently recording atmospheric pressure and wind speed while shivering at high altitudes, there is a carnival barker with a bevy of pretty girls willing to dangle from a basket or parachute down to earth.}}
  • Although.
  • * 2013 September 28, (Kenan Malik), " London Is Special, but Not That Special," New York Times (retrieved 28 September 2013):
  • While Britain’s recession has been deep and unforgiving, in London it has been relatively shallow.
  • (Northern England, Scotland) Until.
  • * Beaumont and Fletcher
  • I may be conveyed into your chamber; I'll lie under your bed while midnight.
  • As long as.
  • * I. Watts
  • Use your memory; you will sensibly experience a gradual improvement, while you take care not to overload it.

    Verb

    (whil)
  • To pass (time) idly.
  • * Longfellow
  • The lovely lady whiled the hours away.
  • To loiter.
  • (Spectator)

    Derived terms

    * while away * meanwhile * the while