Tuner/ˈtuːnər/ Definition 1 of 2Pro Tip 1/3Professionals Needed People who adjust instrument sounds professionally are often called 'tuners'. The orchestra hired a professional tuner for their grand piano. Pro Tip 2/3Precision Required 'Tuner' is used when precise adjustments of musical instruments are necessary. You'll need a tuner to fine-tune your violin before the concert. Pro Tip 3/3Type Specificity Often, 'tuner' refers to one who specializes in a specific instrument type. Find a guitar tuner who knows about classical guitars.