Strong's #6045: `inyan (pronounced in-yawn')
 from 6031; ado, i.e. (generally) employment or (specifically) an affair:--business, travail.
Brown-Driver-Briggs Hebrew Lexicon:
 
  ‛inyân 
 
 1) occupation, task, job
 
  Part of Speech: noun masculine
Relation: from H6031
Usage:
This word is used 8 times:
Ecclesiastes 1:13: "heaven: this sore  travail hath God given to the sons of man"
Ecclesiastes 2:23: "all his days are sorrows,  and his travail grief; yea, his heart taketh not"
Ecclesiastes 2:26: "and knowledge, and joy: but to the sinner he giveth  travail, to gather and to heap up, that he may give"
Ecclesiastes 3:10: "I have seen  the travail, which God hath given to the sons of men"
Ecclesiastes 4:8: "is also vanity, yea, it is a sore  travail."
Ecclesiastes 5:3: "a dream cometh through the multitude  of business; and a fool's voice is known by multitude of words."
Ecclesiastes 5:14: "riches perish by evil  travail: and he begetteth a son, and there is nothing"
Ecclesiastes 8:16: "wisdom, and to see  the business that is done upon the earth:"