"inverse" in the noun sense
1. inverse, opposite
something inverted in sequence or character or effect
"when the direct approach failed he tried the inverse"
"inverse" in the adjective sense
1. inverse, reverse
reversed (turned backward) in order or nature or effect
opposite in nature or effect or relation to another quantity
"a term is in inverse proportion to another term if it increases (or decreases) as the other decreases (or increases)"
Source: WordNet® (An amazing lexical database of English)
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