noun

1. Refusal or withholding of assents; prohibition, veto

2. A right of veto.

3. An image in which dark areas represent light ones, and the converse.

verb

1. To refuse; to veto.

2. To contradict.

3. To disprove.

adjective

1. Not positive nor neutral.

2. Of electrical charge of an electron and related particles

3. Of a number: less than zero

Synonyms: undesirable

interjection

1. (signalling) An elaborate synonym for no.