It is the basis for many English words like:
* Unanimous: All agreeing, one opinion
* Unique: Being the only one of its kind
* Unity: The state of being united, one in purpose
* Universe: All existing things considered as one whole
* Unicorn: A mythical creature with one horn
It's helpful to remember that unus is the Latin word for one, which helps in understanding the meaning of many words derived from it.