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Entry 1 sense Webster, 1913

Tonicity

· To·nic·i·ty · IPA /təˈnɪsɪti/
01 n. The state of healthy tension or partial contraction of muscle fibers while at rest; tone; tonus.
  1. 1.
    The state of healthy tension or partial contraction of muscle fibers while at rest; tone; tonus.(Physiol.)