1873, noun of state from past participle of interconnect + -ness. Interconnection is attested from 1827.
Entries linking to interconnectedness
interconnect v.
1863, from inter- + connect (v.). Related: Interconnected; interconnecting.
-ness
word-forming element denoting action, quality, or state, attached to an adjective or past participle to form an abstract noun, from Old English -nes(s), from Proto-Germanic *in-assu- (cognates: Old Saxon -nissi, Middle Dutch -nisse, Dutch -nis, Old High German -nissa, German -nis, Gothic -inassus), from *-in-, originally belonging to the noun stem, + *-assu-, abstract noun suffix, probably from the same root as Latin -tudo (see -tude).