The term 'market share' refers to the percentage of a company's total sales in a given market. It is an important measure of a company's success and competitiveness in the marketplace. The crossword solution for the term 'market share' is 'STOCK'. This term is used to refer to the ownership of a company, which is typically divided into shares that are traded on the STOCK market. Therefore, the term 'STOCK' is closely related to the concept of market share, as it is a measure of how much of a company is owned by shareholders.