Etymology
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according (adj./adv.)

c. 1300, "matching, similar, corresponding" (a sense now obsolete), present-participle adjective and adverb from accord (v.). Meanings "conforming (to), compliant, in agreement; consistent, harmonious; suitable, appropriate" are from late 14c. According to "referring to," literally "in a manner agreeing with" is from late 14c. As an adverb, "often applied to persons, but referring elliptically to their statements or opinions" [Century Dictionary].

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Definitions of according

according (adj.)
(followed by `to') in agreement with or accordant with;
according to instructions
according (adj.)
(followed by `to') as reported or stated by;
according to historians
From wordnet.princeton.edu