1. Of, involving, or determined by competition: competitive games. 2. Liking competition or inclined to compete: a highly competitive sales representative. 3. Biochemistry. Relating to the inhibition of enzyme activity that results from the reversible combination of an enzyme with an alternate compound and prevents normal substrate binding. –com·peti·tive·ly adv. –com·peti·tive·ness n.
They are very competitive.