Base Currency

The first currency in a pair — EURUSD = how many USD one EUR buys.

Related terms

Bear MarketA prolonged falling market (commonly −20% from highs). Sellers in control.
BiasYour directional opinion for the session, decided top-down from the higher timeframe BEFORE trading.
BidThe highest price buyers currently offer. You SELL at the bid.
BondA tradeable loan to a government or company paying interest — the world's biggest "safe" market.
Bond YieldThe effective interest a bond pays. Rising yields pull money out of risk assets.
BOS — Break of StructurePrice closes beyond the previous swing IN trend direction — confirmation the trend continues.

Terms stick when you use them. The Money Circle academy walks you through them step by step.