Webster's Revised Unabridged Dictionary · 1913

Posit

Posit , transitive verb

[Latin ponere, positum, to place. See Position.]

1.
To dispose or set firmly or fixedly; to place or dispose in relation to other objects. — Sir M. Hale
2.
(Logic) To assume as real or conceded; as, to posit a principle. — Sir W. Hamilton