Ere is defined as before.
(preposition)An example of ere is saying a person should arrive prior to appetizers being served, ere the serving of the appetizers.
See ere in Webster's New World College Dictionary
Origin: ME er < OE ær, adv., prep., conj., akin to Ger eher, ehe, orig. compar. as seen in Goth airis, earlier < air, early < IE *aier-, dawn < base *ai-, to burn, shine
conjunction
See ere in American Heritage Dictionary 4
preposition
Origin:
Origin: Middle English er
Origin: , from Old English ǣr; see ayer- in Indo-European roots
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