Definition of for conjunction from the Oxford Advanced American Dictionary

 

for

 conjunction
conjunction
NAmE//fər//
 
, NAmE//fɔr//
 
(old-fashioned or )
 
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(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.
See the Oxford Advanced Learner's Dictionary entry: for