名詞 declension:

1. the inflection of nouns and pronouns and adjectives in Indo-European languages
2. process of changing to an inferior state
   同義詞：deterioration, decline in quality, worsening
3. a downward slope or bend
   同義詞：descent, declivity, fall, decline, declination, downslope
4. a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms

1. In Latin, the nominative case of first declension nouns ends in a'.
   在拉丁文中，屬於第一類詞形變化的名詞的主格以a結(jié)尾。
2. Declension means varying the forms of nouns, pronouns and adjectives in a sentence.
   變格是指名詞、代詞和形容詞在句中的形式變化。

de.clen.sion

n.Abbr. dec.,decl.（名詞）縮寫 dec.,decl.
Linguistics
【語言學】
In certain languages, the inflection of nouns, pronouns, and adjectives in categories such as case, number, and gender.
詞形變化：某些語言中，名詞，代詞和形容詞在格，數(shù)和性等方面的詞形變化
A class of words of one language with the same or a similar system of inflections, such as the first declension in Latin.
詞形變化中的一組靜詞：一種語言中的一類詞，它們有相同或相似的詞形變化系統(tǒng)，如拉丁語的第一詞形變化
A descending slope; a descent.
傾斜：下傾的坡；下斜
A decline or decrease; deterioration:
衰退：衰微或縮減；惡化：
例句：
.States and empires have their periods of declension.(Laurence Sterne)
.國家和帝國都有自己的衰落時期.(勞倫斯·斯特內(nèi))

A deviation, as from a standard or practice.
背離：從標準或常規(guī)等的偏離

來源：
Middle English declenson
中古英語 declenson
from Old French declinaison
源自 古法語 declinaison
from Latin dôclon3tiô dôclon3tiôn- [grammatical declension, declination] * see declination
源自 拉丁語 dôclon3tiô dôclon3tiôn- [語法上的詞形變化，衰微] *參見 declination

【引伸】
declen.sional
adj.（形容詞）