Initialism of advanced supersonic transport.
"The government announced that funding would be redirected from the canceled AST project to civilian aviation initiatives."
In plain English: AST is an old-fashioned abbreviation for American Standard Time, which refers to the time zone used in most of the United States and Canada.
"There is no visible ast on this modern drone, making it harder for birds to spot."
Pronunciation spelling of asked, simple past tense and past participle of ask
"The teacher wrote ast on the board to show students how it is pronounced in casual speech."
In plain English: To ast means to stare at something with wide eyes because you are surprised or shocked by it.
"The old house will not ast anyone unless they are standing right next to it on a windy day."
Initialism of Alaskan Standard Time.
"The flight from Seattle to Anchorage had a short layover in the AST time zone before continuing westward."