any federal law-enforcement officer
"The fed who stopped my car didn't seem to have a warrant for me, just his badge and an air of authority."
the central bank of the United States; incorporates 12 Federal Reserve branch banks and all national banks and state-chartered commercial banks and some trust companies
"the Fed seeks to control the United States economy by raising and lowering short-term interest rates and the money supply"
a federal government officer or official, especially FBI, CIA, NSA, ATF, and DEA agents.
"The engineer explained that a field emission display uses nano-sized tips to emit electrons when they are fed by an electric current."
A “federation” in which powerlifters organize to compete.
Field emission display.
In plain English: A fed is an undercover government agent who secretly works to stop criminals.
"The cat ate until she was fed to the brim."
Usage: Do not use "fed" as a noun to mean a field emission display; that term is actually an acronym (FED). As a noun in everyday English, "fed" is simply a slang shortening of "federal," such as when referring to the FBI or federal agents.
simple past tense and past participle of feed
"After I fed the dog his dinner, he immediately ran outside to play."
In plain English: To feed someone means to give them food so they are not hungry.
"The stray cat seemed grateful after I fed him some tuna."
Usage: Use "fed" to describe the action of giving food to someone or something in the past, such as saying you fed your dog yesterday. It functions as both the simple past tense and the past participle of the verb feed.
Federal Reserve System. Alternative spelling of Fed
"After the Fed raised interest rates, mortgage payments across the country began to climb significantly."
Abbreviation of Federal Reserve. (The Federal Reserve Board or System)
Fed is a shortened form of the word federal. It entered common usage as a convenient nickname for the Federal Reserve System and its policies.