This is the 7883rd most frequent Japanese word.
固有
"固有" means "unique" or "inherent" to something.
In this sentence, '固有' (koyuu) is used to describe expressions that are unique or distinctive to the Japanese language.
日本語には固有の表現が多いです。
Japanese has many unique expressions.
Here, '固有' conveys the idea of an individual's distinctive style, something that is characteristic of that person.
彼の固有のスタイルはとても印象的です。
His unique style is very impressive.
In this case, '固有' refers to ecosystems that are specific or unique to a particular region or environment.