1. A reflexive or reciprocal pronoun: oneself, himself, herself, itself, yourself; themselves; yourselves; each other; one another

2. A pronoun used with transitive verbs to create the passive voice

3. A pronoun used with a verb conjugated in the third-person singular to convey an impersonal meaning

4. Used to third person subjunctive moods to form an impersonal imperative. (formal)

5. used instead of indirect object pronouns le and les before the direct object pronouns lo, la, los, or las