Italian word attendere comes from Latin ad ((direction) toward, to, on, up to, for.), Latin attineo, Latin tendere, Latin tendo

Detailed word origin of attendere

Dictionary entry	Language	Definition
ad	Latin (lat)	(direction) toward, to, on, up to, for.
attineo	Latin (lat)	(used impersonally) I am useful or important.. (used impersonally) I belong somewhere, pertain or relate to, concern.. I bring or hold to or near.. I hold fast, keep, detain, hold back, delay.. I hold possession of, retain, occupy, preserve, keep, guard.. I stretch or reach out to.
tendere	Latin (lat)
tendo	Latin (lat)	I pitch (a tent).. I proceed.. I stretch, stretch out, distend, extend.. I strive for; I reach for.
attendo	Latin (lat)	I direct or turn toward.. I pay attention, attend (to).
attendere	Italian (ita)	(intransitive) to attend on. (transitive) to wait for.

Words with the same origin as attendere