whether
Pronunciation: /ˈwɛðə/
conjunction
- expressing a doubt or choice between alternatives: he seemed undecided whether to go or stay it is still not clear whether or not he realizes
- expressing an enquiry or investigation (often used in indirect questions): I’ll see whether she’s at home
- indicating that a statement applies whichever of the alternatives mentioned is the case: I’m going whether you like it or not
Origin:
Old English hwæther, hwether, of Germanic origin; related to German weder 'neither'
On the difference between whether and if, see if (usage).