Real Dictionary

step in American English
the act of moving and placing the foot forward, backward, sideways, up, or down, as in walking, dancing, or climbing
noun: a movement made by lifting the foot and setting it down again in a new position, accompanied by a shifting of the weight of the body in the direction of the new position, as in walking, running, or dancing

step in British English
noun: a set of aerobic exercises designed to improve the cardiovascular system, which consists of stepping on and off a special box of adjustable height
noun: the act of motion brought about by raising the foot and setting it down again in coordination with the transference of the weight of the body
noun acronym for: Special Temporary Employment Programme

step- in American English
related through the remarriage of a parent
prefix: a prefix denoting connection between members of a family by the remarriage of a parent and not by blood

step- in British English
combining form: indicating relationship through the previous union of a spouse or the current union of a parent, rather than by blood