1. An elevated place or structure before which religious ceremonies may be enacted or upon which sacrifices may be offered.
2. A structure, typically a table, before which the divine offices are recited and upon which the Eucharist is celebrated in Christian churches.

[Middle English auter, from Old English altar and Old French auter, both from Latin altāre.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.