lead·ing 
/ˈli:dɪŋ/ adjective
always used before a noun /ˈli:dɪŋ/ adjective 1 : having great importance, influence, or success
▪ a leading topic of conversation ▪ Their family played a leading part in the settlement of the town. ▪ the leading role in a major Hollywood movie ▪ a leading citizen of the town ▪ She's one of the leading authorities/experts on the stock market. 2 : most important : foremost
▪ What is the leading [=number one] health problem for older women?
▪ a leading topic of conversation ▪ Their family played a leading part in the settlement of the town. ▪ the leading role in a major Hollywood movie ▪ a leading citizen of the town ▪ She's one of the leading authorities/experts on the stock market.
▪ What is the leading [=number one] health problem for older women?
