晚饭 (wǎnfàn) is a noun meaning "dinner" or "evening meal." It combines 晚 (evening) with 饭 (meal/rice). It is one of the most common ways to refer to the evening meal in everyday Chinese conversation.
今天晚饭你想吃什么?
Jīntiān wǎnfàn nǐ xiǎng chī shénme?
What do you want to eat for dinner tonight?
妈妈做的晚饭已经准备好了,快来吃吧。
Māma zuò de wǎnfàn yǐjīng zhǔnbèi hǎo le, kuài lái chī ba.
Mom's dinner is ready, come eat!
我们一起出去吃晚饭怎么样?
Wǒmen yīqǐ chūqù chī wǎnfàn zěnmeyàng?
How about we go out for dinner together?