in is on the Basic English 850 List.
impulse - in - increase
in is one of the 1000 most common headwords.
improve - in - include

Pronunciation change

Preposition change

Preposition
in

 
It is in the box
  1. Used to show that something is inside something else.
    The cat is in the box.
  2. Used to show that someone is at home, or is available.
    Is John in?
    The Doctor is now in.
  3. Used to show movement towards the inside.
    The rain came in through the window.
  4. Used to introduce an explanation or clarification of the previous statement with a that clause.
    Toronto is a little different, in that it's not quite as cold.

Antonyms change

Related words change

Abbreviation change

Abbreviation
in

  1. Short for inch or inches.