| approof | proof, affirmation, attestation |
| aver | provide, furnish, affirm |
| avouch | declare, assert, affirm |
| avouchment | [affirmation] misuse of ‘avouch’ [sense 1] |
| fore-vouched | previously declared, earlier affirmed |
| good as the best | expression of strong affirmation |
| grant | acknowledge, confess, affirm |
| justify | affirm, acknowledge, corroborate |
| pass | confirm, ratify, affirm |
| position | [in logic] affirmation, assertion, hypothesis |
| profess | declare, avow, affirm |
| protest | make protestation, avow, affirm, proclaim |
| protestation | solemn declaration, affirmation |
| protester | declarer of friendship, affirmer of affection |
| saying | promising, affirmation, assertion |
| take | affirm, swear, take an oath |
| word | declaration, affirmation, proclamation |