Definition of USD (United States Dollar)
The official currency of the United States and the world's primary reserve currency. The USD is involved in approximately 88% of all forex transactions and is the base or quote currency in all major pairs.
At a glance
Term
USD (United States Dollar)
URL slug
usd-united-states-dollar
Category
Instruments
Short answer
The official currency of the United States and the world's primary reserve currency.
Deep dives
Full A–Z glossary
Example
Apply the definition: restate “USD (United States Dollar)” in one sentence tied to your next trade (symbol, direction, size, stop). If you cannot, re-read the definition above.
Common mistake
Common mistake: using “USD (United States Dollar)” as loose slang while your broker/platform specification defines it more narrowly.
Professional tip
Tip: bookmark this “USD (United States Dollar)” page and reopen it when reading broker specs so definitions stay consistent.
Practice tools:
Related terms
FAQ
The official currency of the United States and the world's primary reserve currency.
Knowing the precise definition of “USD (United States Dollar)” prevents platform and broker-spec mistakes—a common source of size and cost errors.
Common mistake: using “USD (United States Dollar)” as loose slang while your broker/platform specification defines it more narrowly.