Definition of for conjunction from the Oxford Advanced Learner's Dictionary

 

for

 conjunction
conjunction
BrE BrE//fə(r)//
 
; NAmE NAmE//fər//
 
; BrE strong form BrE//fɔː(r)//
 
; NAmE strong form NAmE//fɔːr//
 
 
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(old-fashioned or literary) used to introduce the reason for something mentioned in the previous statement We listened eagerly, for he brought news of our families. I believed her—for surely she would not lie to me. Word Origin Old English, probably a reduction of a Germanic preposition meaning ‘before’ (in place or time); related to German für, also to fore.
See the Oxford Advanced American Dictionary entry: for