Definitions

1. verb

used to express ability or capacity; to be able to do something

“She could speak several languages fluently.”

2. auxiliary verb

used to express possibility or doubt about something

“It could be that they are running late.”

3. auxiliary verb

used to express ability or capacity in the past

“She could play the piano when she was a child.”

4. noun

a hypothetical or potential situation

“What could have been if we had made different choices?”