This is the 4840th most frequent Russian word.
имеющий
"Having" or "possessing."
Here, "имеющий" functions as an attributive participle that describes the characteristic of "человек" (person). It translates to "having" in English.
Человек, имеющий много друзей, счастлив.
A person having many friends is happy.
In this sentence, "имеющий" specifies the quality of the "документ" (document), serving as an attributive participle.
Документ, имеющий юридическую силу, был подписью подтвержден.
The document having legal force was confirmed by a signature.
Here, "имеющий" is used in a generic sense to describe someone (subject implicit) with the capability, functioning as an definite participle.