Adjective

(en adjective)

Relating to, or characteristic of life.

vital''' energies; '''vital''' functions; '''vital actions

Necessary to the continuation of life; being the seat of life; being that on which life depends.

The brain is a vital organ.

* Spenser

Do the heavens afford him vital food?

Invigorating or life-giving.

Necessary to continued existence.

The transition to farming was vital for the creation of civilisation.

Relating to the recording of life events.

Birth, marriage and death certificates are vital records.

Very important.

It is vital that you don't forget to do your homework.

* {{quote-magazine, date=2012-12-14

, author=Simon Jenkins, authorlink=Simon Jenkins , title=We mustn't overreact to North Korea boys' toys , volume=188, issue=2, page=23 , date=2012-12-21 , magazine= citation , passage=David Cameron insists that his latest communications data bill is “vital to counter terrorism”. Yet terror is mayhem. It is no threat to freedom. That threat is from counter-terror, from ministers capitulating to securocrats.}}

Containing life; living.

* Milton

spirits that live throughout, vital in every part

* Alexander Pope

The dart flew on, and pierced a vital part.

Capable of living; in a state to live; viable.

* Sir Thomas Browne

Pythagoras and Hippocrates affirm the birth of the seventh month to be vital .

Adjective

Familiar, famous, renowned or widely known.

* , chapter=15

, title= The Mirror and the Lamp , passage=Edward Churchill still attended to his work in a hopeless mechanical manner like a sleep-walker who walks safely on a well-known round. But his Roman collar galled him, his cossack stifled him, his biretta was as uncomfortable as a merry-andrew's cap and bells.}}

* {{quote-magazine, year=2013, month=July-August, author= Philip J. Bushnell

, magazine=(American Scientist), title= Solvents, Ethanol, Car Crashes & Tolerance , passage=Furthermore, this increase in risk is comparable to the risk of death from leukemia after long-term exposure to benzene, another solvent, which has the well-known property of causing this type of cancer.}}

(computing, not comparable) Generally recognised; reserved for some usual purpose.

* 1972 , Vint Cerf, Jon Postel, RFC 322 - Well known socket numbers

We would like to catalog other sockets which are supposed to be well-known

* 2003 , John Mueller, .NET development security solutions

If the call to this function fails, you can assume the SID was invalid — even if it's a well-known SID.

* 2007 , Larry L Peterson, Bruce S Davie, Computer networks: a systems approach

A common approach is for the server to accept messages at a well-known port.