WebBritannica Dictionary definition of CHANGE 1 a [no object] : to become different Her mood changes every hour. Standard Error of the Mean vs. Standard Deviation: What's the Difference? Web1 of 2 verb chnj changed; changing transitive verb 1 a : to make different in some particular : alter never bothered to change the will b : to make radically different : transform can't change human nature c : to give a different position, course, or direction to changed his residence from Ohio to California 2 a : to replace with another This event is limited to elements,