Indeed Definition

ĭn-dēd

adverb

Certainly; truly; admittedly.

Webster's New World

In fact; in reality.

Felt sure I'd win, and indeed I did.

American Heritage

Indeed is defined as a word used to emphasize the truth of something or to agree that something is true.

An example of indeed is an affirmative comment you would use when a party was very good.

An example of indeed is an answer you give when someone asks you about the truth of a fact.

An example of indeed is when you add an additional and sort of suprising piece of information to a sentence.

YourDictionary

Synonyms:

interjection

Used to express surprise, doubt, sarcasm, irony, etc.

Webster's New World

Indicates emphatic agreement.

"I'm a great runner." "Indeed!"

Wiktionary

Synonyms:

Origin of Indeed

From Middle English indede, equivalent to in- +‎ deed (similar to in fact). Compare also West Frisian yndied, Dutch inderdaad (“indeed”) and German in der Tat (“indeed”). More at in, deed.

From Wiktionary
Middle English in dede in fact in in in¹ dede deed, fact deed

From American Heritage Dictionary of the English Language, 5th Edition