dep·u·ty 
/ˈdɛpjəti/ noun
plural dep·u·ties /ˈdɛpjəti/ noun [count] 1 : an important assistant who helps the person who the leader of a government, organization, etc.
▪ (US) a sheriff's deputy [=an assistant who helps a sheriff enforce the law] — often used before another noun ▪ a deputy sheriff ▪ She's now the department's deputy director. ▪ a deputy mayor 2 : a member of Parliament in some countries
▪ (US) a sheriff's deputy [=an assistant who helps a sheriff enforce the law] — often used before another noun ▪ a deputy sheriff ▪ She's now the department's deputy director. ▪ a deputy mayor
