(n.) Ray-sohn D'etrah.
In French, literally, "Reason of being/ Reason (of) to be."
Raison D'etre is a term used to signify one's own existence. It is used to show that one has rights to be where they are or to do as they are doing.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

1. sense of purpose, your individual sense of purpose in life.
2. Dogfish Head Ale makes a tasty beer called raison d'etre, it is %8.0 alcohol, it is brewed with raisons and a sense of purpose.