| 1 | under | prep. | below; below the surface of; less than; as called for by a law, agreement or system ("The river flows under the bridge." "Such action is not permitted under the law.") |
| 2 | understand | v. | to know what is meant; to have knowledge of |
| 3 | unite | v. | to join together |
| 4 | universe | n. | all of space, including planets and stars |
| 5 | university | n. | a place of education that usually includes several colleges and research organizations |
| 6 | unless | conj. | except if it happens; on condition that ("I will not go, unless the rain stops.") |
| 7 | until | conj. | up to a time; before |
| 8 | up | ad. | to, in or at a higher position or value |
| 9 | urge | v. | to advise strongly; to make a great effort to get someone to do something |
| 10 | urgent | ad. | needing an immediate decision or action |
| 11 | us | pro. | the form of the word "we" used after a preposition ("He said he would write to us.") or used as an object of a verb ("They saw us yesterday.") |
| 12 | use | v. | to employ for a purpose; to put into action |
| 13 | usual | ad. | as is normal or common; as is most often done, seen or heard |