Definition of: only

(ōn′lē) adverb
1. Without another or others; singly.
2. In one manner or for one purpose alone.
3. In full; wholly.
4. Solely; merely; exclusively: limiting a statement to a single defined person, thing, or number.
—adjective
1. Alone in its class; having no fellow or mate; sole; single; solitary: an only child.
2. Standing alone by reason of excellence. See synonyms under SOLITARY.
—conj. Except that; but. [OE ānlīc <ān one + -lic -LY]