a personality type characterized by tenseness, drive, aggression, etc., traits thought to make one more susceptible to heart attacks
Word origin
first used (c. 1974) by M. Friedman & R. Rosenman, U.S. physicians
Type A in American English
noun Psychology
1.
of or pertaining to a pattern of behavior characterized by competitiveness, a sense of urgency, impatience, perfectionism, and assertiveness, and possibly associated with an increased risk of heart disease
2.
of or pertaining to a person who exhibits Type A behavior