[ C ] a group of nouns or adjectives that decline in the same way(名词或形容词的)词形变化;变格
How many declensions are there in German?德语有几种词形变化?
Rex is in the third declensionRex 属于第三类词形变化。
[ U ] the act of declining a word, or the way you decline it词形变化;词形变化规则