however

American Heritage® Dictionary of the English Language, Fourth Edition

1. adv. In whatever manner or way: However he did it, it was very clever.
2. adv. To whatever degree or extent: "have begun, however reluctantly, to acknowledge the legitimacy of some of the concerns” ( Christopher Lasch).
3. adv. In what way. Used as an intensive of how: However did you get here so soon?
4. adv. In spite of that; nevertheless; yet: The book is expensive; however, it's worth it.
5. adv. On the other hand; by contrast: The first part was easy; the second, however, took hours.
6. conj. In whatever manner or way: Dress however you like.
7. conj. Archaic Notwithstanding that; although.

Century Dictionary and Cyclopedia

1. In whatever manner; to whatever extent or degree: as, however badly or rudely one may act; however distant from the starting-point.
2. At all events; in any case; by any means.
3. [However often occurs in recent colloquial or provincial use, chiefly in England, for how, interrogative and relative, where the proper usage is how … ever, one or more words intervening. So whatever is similarly used for what … ever.
4. Nevertheless; notwithstanding; yet; still: as, a costly article, which, however, is worth the price.

Wiktionary

1. adv. conjunctive Nevertheless, nonetheless, even so, that said, in spite of this.
2. adv. degree To whatever degree.
3. adv. chiefly UK, as an intensified form in interrogatives In what way; how.
4. conj. In whatever manner.
5. conj. To whatever extent.
6. conj. proscribed Although, though, but, yet.

GNU Webster's 1913

1. adv. In whetever manner, way, or degree.
2. adv. At all events; at least; in any case.
3. conj. Nevertheless; notwithstanding; yet; still; though.

WordNet 3.0

1. adv. despite anything to the contrary (usually following a concession)
2. adv. by contrast; on the other hand
3. adv. in whatever way or manner
4. adv. to whatever degree or extent