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Definition of WAISTLINE. Waistline (clothing) the line of demarcation between the. 2. waistline - Definition of waistline at YourDictionary.com noun. The measurement of this line. 1. A line thought of as encircling the body at the waist. the circumference of the body at the waist : exercises to reduce the waistline. 2. waistline (w st l n) n