ETYM French négatif, Latin negativus, from negare to deny. Related to Negation.
1. Expressing or consisting of a negation or refusal or denial.
2. Characterized by or displaying negation or denial or opposition or resistance; having no positive features.
3. Having the quality of something harmful or unpleasant.
4. Reckoned in a direction opposite to that regarded as positive.
5. Having a negative electric charge; SYN. electronegative.
6. (Medicine) Not indicating the presence of microorganisms or disease or a specific condition; SYN. disconfirming.
7. (Mathematics) Less than zero.

ETYM Cf. French négative.
1. A piece of photographic film showing an image with black and white tones reversed.
2. A reply of denial.

1. To refuse assent to; to reject by or as if by a vote
2. To demonstrate the falsity of
3. To deny the truth, reality, or validity of
4. Neutralize, counteract