This is the 10561st most frequent Russian word.
владеющая
"Владеющая" means "possessing" or "having mastery over."
In this sentence, 'владеющая' is in the present active participle form, describing Elena as someone who possesses or is proficient in the English language.
Елена — студентка, владеющая английским языком.
Elena is a student proficient in the English language.
Here, 'владеющая' describes the book as having or containing a particular characteristic, giving it an active quality that provokes intrigue.
Это книга, владеющая загадочным очарованием.
This is a book possessing a mysterious charm.
In this context, 'владеющих' is used in the present active participle form to describe individuals who possess expertise in dance.