only

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Alone in kind or class; sole: an only child; the only one left.
2. adj. Standing alone by reason of superiority or excellence.
3. adv. Without anyone or anything else; alone: room for only one passenger.
4. adv. At the very least: If you would only come home. The story was only too true.
5. adv. And nothing else or more: I only work here.
6. adv. Exclusively; solely: facts known only to us.
7. adv. In the last analysis or final outcome: actions that will only make things worse.
8. adv. With the final result; nevertheless: received a raise only to be laid off.
9. adv. As recently as: called me only last month.
10. adv. In the immediate past: only just saw them.
11. conj. Were it not that; except.
12. conj. With the restriction that; but: You may go, only be careful.
13. conj. However; and yet: The merchandise is well made, only we can't use it.

Century Dictionary and Cyclopedia

1. Single as regards number, or as regards class or kind; one and no more or other; single; sole: as, he was the only person present; the only answer possible; an only son; my only friend; the only assignable reason.
2. Alone; nothing or nobody but.
3. Mere; simple.
4. Single in degree or excellence; hence, distinguished above or beyond all others; special.
5. Alone; no other or others than; nothing or nobody else than; nothing or nobody but; merely: as, only one remained; man cannot live on bread only.
6. No more than; merely; simply; just: as, he had sold only two.
7. In but one manner, for but one purpose, by but one means, with but one result, etc.; in no other manner, respect, place, direction, circumstances, or condition than; at no other time, or in no other way, etc., than; for no other purpose or with no other result than; solely; exclusively; entirely; altogether: as, he ventured forth only at night; he was saved only by the skin of his teeth; he escaped the gallows only to be drowned; articles sold only in packages.
8. Above all others; preëminently; especially.
9. Singly; with no other in the same relation: as, the only begotten Son of the Father.
10. Synonyms 1-3. Alone, Only. See alone.
11. But; except; excepting that.
12. Except; with the exception of.

Wiktionary

1. adj. Alone in a category.
2. adj. Singularly superior; the best.
3. adj. Without sibling; without a sibling of the same gender.
4. adj. obsolete Mere.
5. adv. without others or anything further; exclusively
6. adv. no more than; just
7. adv. as recently as
8. conj. Under the condition that; but.
9. conj. However.
10. conj. But for the fact that; except.

GNU Webster's 1913

1. adj. One alone; single.
2. adj. Alone in its class; by itself; not associated with others of the same class or kind.
3. adj. Alone, by reason of superiority; preëminent; chief.
4. adv. In one manner or degree; for one purpose alone; simply; merely; barely.
5. adv. So and no otherwise; no other than; exclusively; solely; wholly.
6. adv. Singly; without more.
7. adv. obsolete Above all others; particularly.
8. conj. Save or except (that); -- an adversative used elliptically with or without that, and properly introducing a single fact or consideration.

WordNet 3.0

1. adv. in the final outcome
2. adv. as recently as
3. adv. and nothing more
4. adv. without any others being included or involved
5. adj. exclusive of anyone or anything else
6. adv. with nevertheless the final result
7. adv. never except when
8. adj. being the only one; single and isolated from others
9. adv. except that