adventist

noun

1. Also called Second Adventist. a member of any of certain Christian denominations that maintain that the Second Advent of Christ is imminent.

adjective

2. of or relating to Adventists.

noun

1. a member of any of the Christian groups, such as the Seventh-Day Adventists that hold that the Second Coming of Christ is imminent

1843, from Advent + -ist. Church Latin adventus was applied to the coming of the Savior, both the first or the anticipated second, hence Adventist, a name applied to millenarian sects, especially and originally the Millerites (U.S.).