At that time; then.
Used in comparisons, to introduce the basis of comparison.
introduces a comparison, and is associated with comparatives, and with words such as more, less, and fewer. Typically, it seeks to measure the force of an adjective or similar description between two predicates.
A surname.
Than comes from Old English, where it originally meant "at that time" or "then." It is a doublet of the word then and shares roots with similar words in other Germanic languages like Dutch dan.