Lass/læs/ Definition 1 of 2Pro Tip 1/3Affectionate Tone Use 'lass' to add a friendly, affectionate tone when addressing a young woman. Don't worry, lass, we'll sort it out. Pro Tip 2/3Cultural Nuance 'Lass' is especially common in Scotland and Northern England, reflecting local culture. No lass from these parts would say no to a ceilidh. Pro Tip 3/3Endearment Sometimes 'lass' is a term of endearment for a young woman, showing fondness. You did a grand job, lass!