At or Better

At or Better
An order to deal at a specific rate or better.
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At or better refers to an instruction given to the dealer to buy or sell currency at a specific rate or better.

AT OR BETTER
Instructions given to a dealer to buy or sell the currency or instrument at a specific rate or better
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The Limit Order Display Rule (SEC Order Handling Rules) requires a market maker that receives a customer limit order priced at or better than its current quote and that does not immediately execute the order, ...

If a buy limit order is placed above the market, the market price would already be below the limit and it would immediately be an order to fill at or better than the limit.

4532; meaning you can buy one US dollar for 1.4532 Swiss francs. At Best An instruction given to a dealer to buy or sell at the best rate that can be obtained. At or Better An order to deal at a specific rate or better.

See also: Order, Market, Exchange, Transaction, Rate