Meaning
It means trendsetting or fashionable in French.I the USA it is a form of dessert.

Origin
It has a French origin and in 1649 it was used in John Selden’s Laws of England:
“Commanders that are never a-la-mode but when all in Iron and Steel.”

As this phrase gained popularity, it was converted in English language as a noun – alamode which means shiny black silk. In the USA its used for an ice cream and its reference is as :
“Tea and buns, apple pie à la mode and chocolate were the most serious menus.”

Meaning
The menu of dishes with price listing.

Origin
No specific records were found on which it could be said that this term was coined in that specific year but in English the first citation is Joseph Sherer’s, Notes and Reflections in 1826:
“He will find comfortable apartments, civil attendance, excellent fare, à la carte, at any hour.”