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Most of the websites i have looked at, say that the frequency of middle C note is approximately 261.626 Hz. and that middle C on guitar is at the 5th string 3rd fret. but my tuner says the frequency at the 5th string 3rd fret is 130.81 Hz.
a. a note having a frequency of 261.63 hertz (middle C) or this value multiplied or divided by any power of 2; the first degree of a major scale containing no sharps or flats (C major) b. a key, string, or pipe producing this note. c. the major or minor key having this note as its tonic.