Latin word teneo comes from Proto-Indo-European *tengʰ-, and later Proto-Indo-European *tetóne (To be stretched, extended.)

Detailed word origin of teneo

Dictionary entry	Language	Definition
*tengʰ-	Proto-Indo-European (ine-pro)
*tetóne	Proto-Indo-European (ine-pro)	To be stretched, extended.
*tenēō	Proto-Italic (itc-pro)	Hold.
teneo	Latin (lat)	(of laws) I am binding on; bind, hold, obligate. (reflexive) I keep back, remain, stay, hold position. I comprise, contain, include, hold. I hold fast, restrain, detain, check, control; bind, fetter. I hold, have; grasp. I insist, uphold. I know, grasp, understand, conceive. I possess, occupy, control. I reach, attain; gain, acquire, obtain. I recollect, retain knowledge of, remember, bear [...]