1. An expression of gratitude said to someone when leaving some social occasion they hosted in the evening. Words like "lovely," "nice," "wonderful," etc., are used before "evening." Thanks for a super evening, guys. What a fantastic party! That was a delicious dinner, and you make for wonderful company. Thanks for a lovely evening all around.

2. An expression of gratitude said to someone after spending an evening with them, as on a date. Thanks for a wonderful evening, Jenny. I'd really like to see you again sometime.