H. P. Grice, P. H. Nowell-Smith, and J. O. Urmson: The principle of conversational appositeness

apposite (adj.)

1620s, "well-put or applied, appropriate," from Latin appositus, adpositus "contiguous, neighboring;" figuratively "fit, proper, suitable," past participle of apponere "lay beside, set near," especially "serve, set before," also "put upon, apply," from ad "to, toward" (see ad-) + ponere "to place" (past participle positus; see position (n.)).