A limit order is an order to buy or sell at a specific price or better. A buy limit price will be executed at the limit price or any price lower i.e., the highest price you are prepared to buy and a sell limit price will be executed at the limit price or higher i.e. the lowest price you are prepared to sell.

Do remind that a limit order will not be filled if there is no matching buy or sell orders at the specified limit price or better.