Learner's definition of ALTAR
a raised place on which sacrifices and gifts are offered in some religions
— sometimes used figuratively
a platform or table used as a center of worship in Christian ceremonies and services
led to the altar
◊ If you are led to the altar, you get married.
left at the altar
◊ If you are left at the altar, you do not get married because the person you were going to marry has decided against it at the last moment.