constant (EN)

adjective, noun

adjective “constant”

1. not changing or able to be changed; lasting and unvarying
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   Her love for her children was constant, never wavering no matter the circumstances.
2. happening regularly or all the time
   His constant requests for snacks made it difficult to get any work done.

noun “constant”

1. something that does not change or vary
   In her life, the one constant was her grandmother's wise advice.
2. a number that does not change in value in a particular mathematical situation
   In the equation E=mc^2, the speed of light, c, is a constant.