| approof | proof, affirmation, attestation |
| avouchment | [affirmation] misuse of ‘avouch’ [sense 1] |
| good as the best | expression of strong affirmation |
| position | [in logic] affirmation, assertion, hypothesis |
| protestation | solemn declaration, affirmation |
| saying | promising, affirmation, assertion |
| word | declaration, affirmation, proclamation |