reason

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reason

1. Philosophy the intellect regarded as a source of knowledge, as contrasted with experience
2. Logic grounds for a belief; a premise of an argument supporting that belief
3. reasons of State political justifications for an immoral act
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

reason

the capacity of the human mind to make logical inferences, undertake rational arguments, understand the world, solve problems. What the nature, social determinants and limits of this capacity are, however, is much debated. See RATIONALISM IDEALISM, EMPIRICISM, ONTOLOGY; see also PRACTICAL REASONING.
Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000
References in periodicals archive ?
Not tho' the soldiers knew Some one had blunder'd: Theirs not to make reply, Theirs not to reason why, Theirs but to do and die: Into the valley of Death Rode the six hundred.
Wrth i filwyr ddod yn l o''r Balkans, cafwyd y gwir am yr amodau yno a gyda cherdd Tennyson, diflannodd peth o''r sglein oddi ar ' The Charge of the Light Brigade'', '' Theirs (y milwyr) not to make a reply, Theirs not to reason why, Theirs but to do or die.
Theirs not to make reply / Theirs not to reason why / Theirs but to do & die