What's the meaning of "Replicate" and "Iterate"?

Replication is the process of something on one machine being copied to another to synchronise the game state. For example, if the server creates a new Part and parents it to Workspace, it will be replicated to every client. For each client, the Part will not exist until it is replicated from the server. This definition is largely specific to multiplayer video game networking.

Iteration is the process of repeating a procedure. For example, if we wanted to go over every key-value pair in a table, we could use a generic for statement with the pairs function to iterate over the table. This definition is largely specific to programming.