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by

BY/baɪ/

23 meanings of by

Practice

  1. 1
    makerpreposition
    Used to say who did, made, or caused something, as in 'a song by the Beatles.'

    This song was written by my older sister when she was sixteen.

    An attack by hackers shut the site down.

    UsageOften after a verb like was written: was written by my sister. Also a song by, a visit by.

    Note
  2. 2
    methodpreposition
    Used to say how something is done or what is used to do it, as in 'go by bus'.

    My aunt pays all her bills by phone now.

    She learned to cook by watching her grandmother in the kitchen.

    Similarvia, through

  3. 3
    amount of changepreposition
    Used to give the amount of a change or a difference, as in 'up by ten'.

    The price of gas went up by twenty cents this week.

    She lost the race by less than one second.

    UsagePut the amount after by: won by two points, up by ten.

    Note
  4. 4
    no later thanpreposition
    Not later than a certain time, as in 'be home by ten'.

    Please send in your homework by Friday at noon.

    The new library should be finished by the end of the year.

    UsageBy ten means at ten or earlier. Until ten means all the time up to ten.

    Similarbefore

    Note
  5. 5
    preposition
    According to what someone says, or to a rule, law or way of measuring.

    By law, every child in the car must wear a seat belt.

    By the look of the sky, it's going to snow tonight.

    UsageCommon in by law, by all accounts, and judge by.

    Note
  6. 6
    preposition
    Used to say what rule or feature is used to sort or arrange things.

    I sorted the files by date.

    The results are broken down by age and sex.

    UsageUsually no article: sort by date, by name.

More uses

Practice

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Origin

It comes from Old English "bī," meaning "by" or "near."

Checked 30 Oct 2026 · 1 fact