ex·haus·tion 
/ɪgˈzɑ:stʃən/ noun
/ɪgˈzɑ:stʃən/ noun [noncount] 1 : the state of being extremely tired : the state of being exhausted
▪ physical/nervous exhaustion ▪ She collapsed in exhaustion. ▪ He worked to the point of complete/total exhaustion. — see also heat exhaustion 2 : the act of using all of something : the act of exhausting something
▪ the exhaustion of our natural resources
▪ physical/nervous exhaustion ▪ She collapsed in exhaustion. ▪ He worked to the point of complete/total exhaustion. — see also heat exhaustion
▪ the exhaustion of our natural resources
