What does las mean?

Answer 1

If you are talking about "las" in Spanish, it doesn't actually mean anything. It is just something that is added before a noun in the Spanish language. For example, "las faldas" means skirts, but "la falda" means skirt. It is something like the Spanish version of "the".

Answer 2

at the (feminine)

It is an idiomatic expression that means more that its literal translation. It means 'by the means of' or 'in the way of'.

For example 'Chicken a la King' mean Chicken prepared in the way of the famous chef Monsieur King.