Definitions

1. adjective

having or feeling a strong desire to possess or keep something or someone

“She had a possessive attitude towards her new pet.”

2. noun

a grammatical construction, such as ‘her book’, where a noun is followed by a possessive pronoun or noun

“The teacher explained the difference between the possessive and genitive forms of nouns.”

3. adverb

used to describe the way in which something is done, especially when it involves a sense of possession or ownership

“He worked possessively, making sure that every detail was perfect.”