adjective
By oneself, solitary.
(predicatively, chiefly in the negative) Lacking peers who share one's beliefs, experiences, practices, etc.
(obsolete) Apart from, or exclusive of, others.
(obsolete) Mere; consisting of nothing further.
(obsolete) Unique; rare; matchless.
adverb
By oneself; apart from, or exclusive of, others; solo.
Without outside help.
Focus adverb, typically modifying a noun and occurring immediately after it.