Simple examples:
* The committee rejected the proposal due to its lack of feasibility.
* The scientist rejected the hypothesis after the experiment yielded inconsistent results.
* She rejected his advances because she wasn't interested.
Examples showing different meanings:
* He rejected his old, worn-out shoes for a fresh new pair.
* The machine rejected the faulty part, preventing it from being assembled.
* The artist rejected the traditional approach, choosing to experiment with new techniques.
Examples in context:
* After being rejected by several publishers, the author finally found a home for their manuscript.
* The company was rejected from the investment program because it didn't meet the eligibility criteria.
* She felt a pang of sadness when he rejected her invitation, but she understood his reasons.
Remember: "Reject" can be used as a verb (to refuse, to discard) or a noun (something that has been refused or discarded). The context will determine its meaning.