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reason why

noun

Roget 615: motive, springs of action, wellsprings of action.    reason, ground, call, principle; by end, by purpose; mainspring, primum mobile [Lat.], keystone; the why and the wherefore; ... show more

Roget 153: cause, origin, source, principle, element; occasioner, prime mover, primum mobile [Lat.]; vera causa [Lat.]; author etc. (producer) 164; mainspring; ... show more

Roget 155: attribution, theory, etiology, ascription, reference to, rationale; accounting for etc. v.; palaetiology1, imputation, derivation from.    filiation, affiliation; ... show more

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