What does meq stand for?

The equivalent (symbol: eq or Eq), sometimes termed the molar equivalent, is a unit of amount of substance used in chemistry and the biological sciences.

The equivalent is formally defined as the amount of a substance which will either:

• react with or supply one mole of hydrogen ions (H+) in an acid-base reaction; or
• react with or supply one mole of electrons in a redox reaction.[1][2]