The choicest or most essential or most vital part of some idea or experience
English: kernel, substance, core, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, nub, pith, sum, nitty-gritty
Bahasa: hati, bahan, dasar, pusat, jantung, benda, isi, inti
Less certain link between this word and this sense.