A word with a definition that does not YET exist on Urban Dictionary.

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.

The creation of a new word. It can be used in many ways.

All the definitions on Urban Dictionary were written by people just like you. Now's your chance to add your own!

Please review Urban Dictionary's content guidelines before writing your definition. Here's the short version: Share definitions that other people will find meaningful and never post hate speech or people’s personal information.

Write for a large audience. Lots of people will read this, so give some background information.
Don't name your friends. We'll reject inside jokes and definitions naming non-celebrities.

All the definitions on Urban Dictionary were written by people just like you. Now's your chance to add your own!

An UrbanDictionary feature finally brought back.

Something that 1 and a half-year-olds say every day, but no one is smart enough to document them or assign meaning.