To reply to a question from (someone) at a later time.
To reply impertinently to (someone); to talk back.
To issue echo characters, protocol responses, reflexive connection requests, etc.
To ask (somebody) to do something.
To ask for (something).
A message sent over a network to a server.
Act of requesting (with the adposition at in the presence of possessives, and on in their absence).
Condition of being sought after.
A formal message requesting something.