What is (a) The sign of staccato, a small mark [. (b) The line drawn through a figure in the thorough bass, as a direction to raise the interval a semitone called?

dash — (Mus.) (a) The sign of staccato, a small mark [. (b) The line drawn through a figure in the thorough bass, as a direction to raise the interval a semitone. (Webster's 1913.)

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