B2[C or U]a willingness to give your time and energy to something that you believe in, or a promise or firm decision to do something: Players must make a commitment to play for a full season.her commitment to left-wing politics/the cause of feminism/the companyShe is known chiefly for her commitment to nuclear disarmament.I'd like to thank the staff for having shown such commitment.Try the product out in the comfort of your own home with absolutely no commitment to buy!Making and breaking promises and commitmentsB2[C]something that you must do or deal with that takes your time: family/work commitmentsI've got too many commitments at the moment to do an evening class.Children are such a commitment.Duty, obligation and responsibility