Concepts
Record
Root
++→
सच्चिदानन्द
sac-cid-ānanda
Sound change: t → c before c; t → d before a vowel.
Literally: Being, awareness, bliss.
Dimensions
What the usual translation loses
any single word
No one English word holds all three. The compound says reality is, knows, and is full, all at once.
Where you meet it
Not in the ślokas here yet.