means the degree of force, energy, or concentration with which something is felt, done, or experienced.

from From Latin 'intensus,' the past participle of 'intendere' — literally 'to stretch out,' from 'in-' (toward) plus 'tendere' (to stretch). The same 'tendere' gives us 'tension,' 'tendon,' and 'tense'; the underlying image is a bowstring pulled taut, a thing strained to its limit. It reached English through French in the late medieval period, carrying that sense of something stretched tight with feeling or strength.