B2[U]the ability to do things that need a lot of physical or mental effort: She had the strength and stamina to take the lead and win the gold medal.Admitting you've made a mistake is a sign of strength, not weakness.He showed great strength of character when he refused to accept the bribes.We shall struggle on, drawing our strength from the courage of others.Much of the country's military strength lies in its missile force.Fit and healthyC2[Cusually singular]the degree to which something is strong or powerful: Opinion polls put the combined strength of the two parties at 15 percent nationwide.You can gauge(= measure) the strength of a democracy by the way it treats its minorities.Power and intensityEnergy, force and power