noun which may take the genitive case particle 'no', na-adjective, noun
Describes something that is the other way around, contrary, or inverted in direction, order, or meaning. Used as a noun, な-adjective, or with の.
彼の意見は私とは逆だ。
His opinion is the opposite of mine.
逆の方向に歩いてしまった。
I ended up walking in the opposite direction.
na-adjective, noun
Used in logic or mathematics for the converse of a proposition or hypothesis. Often appears in academic contexts.
「AならばB」の逆は「BならばA」である。
The converse of 'if A then B' is 'if B then A'.
noun, used as a prefix
Mathematical prefix for inverse functions, e.g., 逆関数 (inverse function). Not used as a standalone word in this sense.
逆三角関数は高校で習う。
Inverse trigonometric functions are learned in high school.