I / intensĭo
noun

intensĭo

gen. intensōnis · gender feminine · decl. 3rd
A stretching out; straining; effort
A stretching out, straining, effort: oculorum, Scrib. Comp. 255.—
An intensifying; increase
An intensifying, increase: calorem suum (sol) intensionibus ac remissionibus temperando fovet, Sen. Q. N. 7, 1, 3.—
The tune
The tune: gravis, media, acuta, Censor. 12.