increaseincreaseincreasesincreasedincreasingverb (increases, increasing, increased)pronunciationBe careful how you say this word. When increase is a verb, you say the second part of the word louder: inCREASE. When increase is a noun, you say the first part of the word louder: INcrease.to become bigger or more; to make something bigger or more: The number of women who go out to work has increased. I'm going to increase your pocket money to £5.▶ increasenoun: There has been an increase in road accidents.a price increaseoppositedecrease