01 n. The act or the state of declining; declination; descent; slope.
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1.
The act or the state of declining; declination; descent; slope.“The declension of the land from that place to the sea.” — T. Burnet.
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2.
A falling off towards a worse state; a downward tendency; deterioration; decay; as, the declension of virtue, of science, of a state, etc.“Seduced the pitch and height of all his thoughts To base declension.” — Shak.
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3.
Act of courteously refusing; act of declining; a declinature; refusal; as, the declension of a nomination.
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4.
Inflection of nouns, adjectives, etc., according to the grammatical cases.(Gram.)
Phrases & compounds
Declension of the needle —
declination of the needle.