sci

know

Spelled sci · scire 'to know,' with participle sciens 'knowing'

Latin scire meant know: science seeks knowledge, conscious people are aware, and an omniscient narrator knows every character's thoughts.

Words built from it

science — systematic study of the world through evidence and testing
sci (know) + -ence (state)
conscious — awake and aware of oneself or one's surroundings
con- (with) + sci (know) + -ous (characterized by)
omniscient — knowing everything
omni- (all) + sci (know) + -ent (doing)
prescience — knowledge of events before they happen
pre- (before) + sci (know) + -ence (state)
nescient — lacking knowledge or awareness
ne- (not) + sci (know) + -ent (doing)
unconscious — not awake and aware; also, occurring without awareness
un- (not) + con- (with) + sci (know) + -ous (characterized by)

fascinate — Contains sci, but comes from Latin fascinare 'to bewitch,' unrelated to scire 'to know.'
scintillate — Contains sci, but comes from Latin scintillare 'to sparkle,' from scintilla 'spark.'