| approximation |
an estimate; guess. |
| artifact |
any object made by human beings, especially one of an earlier era. |
| Aurora |
bands or streamers of light that appear in the sky at night in areas around the magnetic poles, caused by solar particles striking atoms in the outer part of the earth's atmosphere. |
| breakthrough |
an important discovery in a particular field that encourages an acceleration in knowledge or expertise. |
| burly |
having a large, husky, and strong body. |
| circumstance |
a condition or fact connected with or having an effect on an event or situation. |
| consideration |
careful attention or thought. |
| controversy |
a disagreement; debate. |
| cooperative |
willing to work together or cooperate. |
| decline |
to refuse to do, in a polite way. |
| denomination |
a religious group or division. |
| negotiable |
subject to discussion and revision, as terms in an agreement or contract. |
| rationale |
a fundamental reason for doing or being; basis. |
| recuperate |
to become healthy again after being ill. |
| refined |
displaying qualities of good breeding or sensitivity of feeling or taste. |