Saccidānanda joins three words: sat, being or reality; cit, consciousness; and ānanda, bliss. Vedānta uses the compound as the nearest positive description of Brahman, while holding that the three are not qualities added to it but its very nature, one and undivided. The formula became a common name for the absolute in later Hindu devotion and teaching.
Saccidānanda
Being, consciousness and bliss: a classic Vedānta description of the nature of Brahman.
Also: Sat-chit-ananda, Satchidananda