At that time; then.
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 player than whom none is more skillful.
Used in comparisons, to introduce the basis of comparison.
she's taller than I am; she found his advice more witty than helpful; we have less work today than we had yesterday; We had no choice than to return home
(obsolete outside dialectal, usually used with for) Because; for.