1. physical or mental energy used to do something; hard work
2. an attempt to do something, especially when it is difficult
3. the result of an attempt; something produced by trying

Examples

• She put a lot of effort into her homework.
• The team made a great effort to win the game.
• Learning a new language requires considerable effort.
• His first effort at cooking was not very successful.
• The rescue effort continued through the night.
• It was a good effort, but we still lost.
• With some effort, you can solve this problem.