▁between ▁each ▁of ▁their ▁languages . ▁ ▁Since ▁Google ▁started ▁an ▁initi ative ▁called ▁Know ledge ▁Graph ▁in ▁ 2 0 1 2 , ▁a ▁substantial ▁amount ▁of ▁research ▁has ▁used ▁the ▁phrase ▁knowledge ▁graph ▁as ▁a ▁generalized ▁term . ▁Although ▁there ▁is ▁no ▁clear ▁definition ▁for ▁the ▁term ▁knowledge ▁graph , ▁it ▁is ▁sometimes ▁used ▁as ▁syn onym ▁for ▁ont ology . ▁One ▁common ▁interpretation ▁is ▁that ▁a ▁knowledge ▁graph ▁represents ▁a ▁collection ▁of ▁inter link ed ▁descri ptions ▁of ▁entities ▁– ▁real - world ▁objects , ▁events , ▁situations ▁or ▁abstract ▁concepts . ▁Un like ▁ont ologies , ▁knowledge ▁graphs , ▁such ▁as ▁Google ' s ▁Know ledge ▁Graph , ▁often ▁contain ▁large ▁volumes ▁of ▁fact ual ▁information ▁with ▁less ▁formal ▁semantics . ▁In ▁some ▁context s , ▁the ▁term ▁knowledge ▁graph ▁is ▁used ▁to ▁refer ▁to ▁any ▁knowledge ▁base ▁that ▁is ▁represented ▁as ▁a ▁graph . ▁ ▁Et ym ology ▁▁ ▁The ▁comp ound ▁word ▁ont ology ▁comb ines ▁onto -, ▁from ▁the ▁Greek ▁ <0xE1> <0xBD> <0x84> ν , ▁on ▁( gen . ▁ <0xE1> <0xBD> <0x84> ν τ ος , ▁ont os ), ▁i . e . ▁" be ing ; ▁that ▁which ▁is ", ▁which ▁is ▁the ▁present ▁partici ple ▁of ▁the ▁verb ▁ ε ἰ μ ί , ▁e im í , ▁i . e . ▁" to ▁be , ▁I ▁am ", ▁and ▁- λ ο γ ί α , ▁- log ia , ▁i . e . ▁" log ical ▁disc ourse ", ▁see