Entry 1 sense Webster, 1913 Anacrotism · A·nac·ro·tism · IPA /əˈnæk.ɹəˌtɪz.əm/ 01 n. A secondary notch in the pulse curve, obtained in a sphygmographic tracing. 1. A secondary notch in the pulse curve, obtained in a sphygmographic tracing.(Physiol.)