De*clin"a*ble (?), a. [Cf. F. déclinable. See Decline.] Capable of being declined; admitting of declension or inflection; as, declinable parts of speech.
De*clin"al (?), a. Declining; sloping.
Dec"li*nate (?), a. [L. declinatus, p. p. of declinare. See Decline.] Bent downward or aside; (Bot.) bending downward in a curve; declined.
Dec`li*na"tion (?), n. [L. declinatio a bending aside, an avoiding: cf. F. déclination a decadence. See Declension.] 1. The act or state of bending downward; inclination; as, declination of the head.
2. The act or state of falling off or declining from excellence or perfection; deterioration; decay; decline. "The declination of monarchy." Bacon.
Summer . . . is not looked on as a time
Of declination or decay.
Waller.