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The Simple English Wikipedia has an article on:
constant is on the Academic Word List.

Pronunciation

change

Adjective

change

Positive
constant

Comparative
more constant

Superlative
most constant

  1. If something is constant, it doesn't change over time.
    I have this constant pain in my back. I wish it would stop.
    The rain has been constant all morning.

Singular
constant

Plural
constants

  1. (technical) A constant is a value that doesn't change.
    In the formula  , 5 is a constant.