Matter

"Matter" referred to all tangible objects that had substance in the universe, being composed of atoms. It was actually one of the materials that made up the universe, along with time, space, and light.

There were several claims that creatures existed before there was matter, including Fenric, a "good force," (TV: The Curse of Fenric) the Beast and its gaolers. (TV: The Impossible Planet/The Satan Pit)

According to the Seventh Doctor, you "[could not] create living matter from inorganic components". (PROSE: Strange England)

When confronted with an occupation and subjugation of Earth, the First Doctor told a Dalek it was misguided and that before the Daleks could conquer the Earth they would have to destroy all living matter. (TV: The Dalek Invasion of Earth)

Upon opening the Eye of Harmony to gain a new cycle of regenerations, the Master proclaimed himself "the Master of all matter." (TV: The Deadly Assassin)

Transmat technology was utilized for matter transmission, allowing an object or person to be teleported atomically from one place to another. (TV: Remembrance of the Daleks)

Anti-matter was the opposite of matter. Contact between the two was explosive, releasing a dangerous amount of radiation. (TV: The Mutants, The Three Doctors)