tend-, tendo-, ten-, teno-, tenot-, tenonto-, tens-, tent-, -tend, -tension, -tent, -tense, -tensive, -tentious

(Greek > Latin: to move in a certain direction; to stretch, to hold out; tension; as well as tendon, sinew)

intendant
A director, manager of a public business, superintendant, etc.; term applied to certain foreign officials, as to the supervisors of any of certain districts in Spanish America.
intended
Meant; planned; having a purpose.
intense
1. Occurring or existing in a high degree; very strong; violent, extreme, sharp, vivid, etc. [stretched out, strained, bent, tight].
2. Strained to the utmost; strenuous; earnest; fervent; zealous.
3. Characterized by much action, emotion, etc.
intensely
intensification
intensifier
intensify
intension (in TEN shuhn) (s) (noun), intensions (pl)
A determination or a strong use of the mind: Elaine's intension to complete the final examination, despite feeling ill, was considered to be very admirable.
intensity
1. The quality of being intense; specifically extreme degree of anything; great energy or vehemence of emotion, thought, or activity.
2. Degree or extent; relative strength, magnitude, vigor, etc.
intensive
intensively
intent
1. Firmly directed or fixed; earnest; intense [a stretching out, extending].
2. Having the mind or attention firmly directed or fixed; engrossed; strongly resolved.
3. Something intended; specifically, a purpose, object, or aim.
intention
Determination to do a specified thing or to act in a specified manner [a stretching out, straining, exertion, effort, attention].
intentional
intentionally

Some related "tension" words are available at this tono- unit.