the capacity for inventive thought and quick understanding; keen intelligence

she does not lack perception or native wit

he needed all his wits to figure out the way back

a natural aptitude for using words and ideas in a quick and inventive way to create humour

his caustic wit cuts through the humbug

have knowledge

I addressed a few words to the lady you wot of

that is to say (used to be more specific about something already referred to)

the textbooks show an irritating parochialism, to wit an almost total exclusion of papers not in English