Definitions

1. adverb

at one time; only one time; at a specified time; on one occasion

“I’ve never been to Paris, but I’d love to go once.”

2. adverb

for the first time; at any time; at any rate

“She had never been on a plane, but she was flying once tomorrow.”

3. conjunction

then; at that time; next; afterwards

“I’ll be there once I finish my work.”

4. noun

a single instance or occasion of something

“I had a great once with my friends over the weekend.”