He used to be a gentleman.

This is a term used in biology.

She used to be diligent.

He is used to the work.

There used to be no freedom of the press.

Roman numerals are used to represent numbers using letters from the Latin alphabet.

Hydrometallurgy is a process used to extract metals from their ores using water-based solutions.

Money of account is a term used to refer to a unit of currency that is used only for accounting purposes.

Radioisotopes are used in medical imaging.

The spindle was used to spin the yarn.