vary

/ˈver-ē/

Middle English varien, borrowed from Anglo-French or Latin; Anglo-French varier, borrowed from Latin variāre "to mark with contrasting colors, give variety to, make changeable," derivative of varius "having contrasting colors, of different kinds, changeable," of uncertain origin

verb

to make a partial change in : make different in some attribute or characteristic
to make differences between items in : diversify
to exhibit or undergo change

change alter vary modify mean to make or become different. change implies making either an essential difference often amounting to a loss of original identity or a substitution of one thing for another. alter implies a difference in some particular respect without suggesting loss of identity.