1. large and solid, like a huge stone
1. A political party must present a monolithic outward appearance so that its enemies cannot identify and exploit its internal divisions.
2. large and solidly uniform; vast and homogeneous
2. In the modern period, caste is slowly becoming less monolithic as more and more people marry according to their personal inclination.
monos (single, alone)#lithos (stone) (Greek)
MONO (SINGLE) + LITHIC (related to ROCKS) --> like a SINGLE ROCK --> SOLID and UNIFORM