1. (n.) The inflection, change of endings of nouns, pronouns, and adjectives; as, he and him; they and them\; the act or the state of declining; declination; descent; slope.

2. (n.) A falling off towards a worse state; a downward tendency; deterioration; decay; as, the declension of virtue, of science, of a state, etc.

3. (n.) Act of courteously refusing; act of declining; a declinature; refusal; as, the declension of a nomination.

4. (n.) Inflection of nouns, adjectives, etc., according to the grammatical cases.

5. (n.) The form of the inflection of a word declined by cases; as, the first or the second declension of nouns, adjectives, etc.

6. (n.) Rehearsing a word as declined.

IC analysis abnegation accidence affix affixation allomorph bound morpheme cascade catabasis cataract chute collapse comedown conjugation contradiction crash cutting debacle debasement decadence decadency deceleration declination declinature decline decline and fall declining decrescendo defluxion deformation degeneracy degenerateness degeneration degradation demotion denial depravation depravedness depreciation deprivation derivation derogation descending descension descent deterioration devolution difference of form dilapidation diminuendo disagreement disallowance disclaimer disclamation disobedience dissent dive down downbend downcome downcurve downfall downflow downgrade downpour downrush downtrend downturn downward mobility downward trend drop dropping dwindling dying ebb effeteness enclitic fading failing fall falling falling-off formative free form gravitation holding back immediate constituent analysis inclination infix infixation inflection involution lapse loss of tone morph morpheme morphemic analysis morphemics morphology morphophonemics nay negation negative negative answer nix no nonacceptance noncompliance nonconsent nonobservance paradigm plummeting plunge pounce prefix prefixation proclitic radical rapids recantation refusal regression rejection remission repudiation retention retreat retrocession retrogradation retrogression root ruination slippage slowdown slump stem stoop subsidence suffix suffixation swoop theme thumbs-down turndown unwillingness wane waterfall withholding word-formation