from The Century Dictionary.
- Giving assent; complying. Savage.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Giving assent; of the nature of assent; complying.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Describing one who
assents, who agrees.
Sorry, no etymologies found.
The last is called by some casuists the refusal assentive.
(Who can read without assentive chuckles his delicious "Lines to a Don!"