An archaic form meaning to make sacred, consecrate, or set apart for religious or sacred purposes.
From Old French 'consacrer,' from Latin 'consecrare' (con- + sacrare, to make sacred); this spelling appears in Middle English and Early Modern English texts before it evolved into the modern 'consecrate.'
Consacre is a ghost word from English history—you'd find it in medieval church records or religious texts describing the ritual blessing of objects or spaces, but it gradually faded as the Latin-influenced 'consecrate' became the standard form.
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