(n.) In the Christian church, a construction of stone, wood, or other material for the celebration of the Holy Eucharist; the communion table.
(n.) A raised structure (as a square or oblong erection of stone or wood) on which sacrifices are offered or incense burned to a deity.
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Webster, Noah. Entry for 'Altar'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/altar.html. 1828.