Against; in opposition to; placed directly across from something.
Latin phrase combining ex- (out) and adversum (opposite, from adversus). This was used in classical and medieval Latin texts as a preposition indicating spatial or conceptual opposition.
This word appears in old property disputes and architectural descriptions—when they wanted to say something was 'right across from' something else, they used exadversum, which eventually influenced how we use 'adversary' and 'advertise' (originally meaning to turn attention toward something).
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