however (adv., conj.)

late 14c., from how + ever.

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Definitions of however from WordNet

however (adv.)
despite anything to the contrary (usually preceding a concession);
although I'm a little afraid, however I'd like to try it
Synonyms: nevertheless / withal / still / yet / all the same / even so / nonetheless / notwithstanding / at the same time
however (adv.)
by contrast; on the other hand; "the first part was easy; the second, however, took hours";
however (adv.)
to whatever degree or extent;
The results, however general, are important
they have begun, however reluctantly, to acknowledge the legitimacy of some of the opposition's concerns
however (adv.)
in whatever way or manner;
however he did it, it was very clever
Victory, however it was brought about, was sweet