The 24 Horas or the 24 Hours, Chatur Vimsati Smritah !
The Science of Definition, NIrukta !
Definition has a Definition and the Science of Definition was known as NIrukta.
Nirukta Sastra was fouded by Yaska to establish Vedic scientific concepts and to destroy unscientific non Vedic concepts, Vasti tasya Niruktam Tu Veda NIrvachanam sphutam!