an elevated place or structure, as a mound or platform, at which religious rites are performed or on which sacrifices are offered to gods, ancestors, etc.
Origin: before 1000; Middle English alter, altar (influenced by L), auter (< Old French aut(i)er), Old English alter (OE also altar; compare Middle Dutch outaer,Old Saxon, Old Norse altari,Old High German altāri) < Latin altāria (plural), of disputed origin and formation, but probably akin to Latin adolēre to ritually burn, Umbrian uřetu let it burn
O.E., from L. altare (pl. altaria), probably originally meaning "burnt offerings" (cf. L. adolere "to worship, to offer sacrifice, to honor by burning sacrifices to"), but infl. by L. altus "high."