Nexus

google

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mid 17th century: from Latin, ‘a binding together’, from nex- ‘bound’, from the verb nectere .

wiktionary

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From Latin nexus(“connection, nexus; act of binding, tying or fastening together; something which binds, binding, bond, fastening, joint; legal obligation”), from nectāre + -tus( suffix forming verbal nouns). [1]Nectāre is the second-person singular present passive subjunctive of nectō(“to attach, bind, connect, fasten, tie; to interweave; to relate; to unite; to bind by obligation, make liable, oblige; to compose, contrive, devise, produce”), from Proto-Indo-European *gned-, *gnod-(“to bind”).

etymonline

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nexus (n.)

1660s, "bond, link, interdependence between members of a series or group; means of communication," from Latin nexus "that which ties or binds together," past participle of nectere "to bind," from PIE root *ned- "to bind, tie."