Shruti
श्रुतिSanskritSay it: shru · ti
The pitch — the tonic the whole ensemble tunes to
MusicBharatanatyamKuchipudiMohiniyattamKathak
Meaning
In everyday use shruti is the base pitch of a performance, the tonic that the drone sounds and every musician tunes to. In theory it also means the finest audible interval of pitch, smaller than a swara.
Also written: sruti, shruthi, sruthi