read the sentence.

we bought a universal keyboard that works with every computer in our house.

which dictionary definition best explains the meaning of the word universal?
adj. of or pertaining to all nature
adj. found in all languages
adj. used or understood by all
adj. present everywhere

adj. used or understood by all

Explanation:

Universal means it is used or understood by all, meaning this keyboard can be used with any system. This fits the description that it works with every computer in the house.

"present everywhere" would not be correct, it is not present everywhere as a keyboard.

"of or pertaining to all nature" is also incorrect, word choice needs to be specific, we aren't talking about nature.

"found in all languages" is incorrect, even though it is understood by all computers, we aren't talking about languages.