Let's meet there at eight.

let's verb

— Used to form the hortative of verbs, equivalent of the first-person plural imperative in some other languages. — let us; forming first-person plural imperative

meet Verb

— When you meet someone, you get together with them. I want to meet you. He meets me at home every afternoon. I met you at the store. — When people meet, they get together with one another. You and I have met. She and her friends meet every day. You and he met last week at school.

there Pronoun

— You use there to say that something exists. There is a problem here.

there Preposition

— To or in that place. We left for Ottawa and arrived there at 7:00.

at Preposition

— Used to describe where something is, or when saying something's position I am at home. Let's meet at the pub! — The time at which something happened or will happen Breakfast is at 9 o'clock. At 5pm we went home. — Indicating something's state At half price! Water boils at high temperatures.

at Symbol

— The @ symbol, used to replace at support@microsoft.com is an email address. Apples @ £1.50 per kilogram.

eight Determiner

— (ordinal eighth) The number eight is one more than seven and one less than nine. Most people work about eight hours a day.

eight Noun

— The number 8. Four and four is eight.