dollar

B2 · Upper Intermediate Uncountable noun Informal

n. a general way to talk about money or wealth.

n. used metonymically to refer to money, wealth, or financial gain.

“He is only doing that job for the dollar, not because he likes it.”

“In the modern film industry, many decisions are driven by the pursuit of the almighty dollar rather than artistic merit.”

C2 · Proficiency Countable noun Science Technical

n. a technical unit used by scientists to measure reactions in nuclear power.

n. a unit of reactivity in a nuclear reactor, defined as the interval between delayed criticality and prompt criticality.

“The engineer calculated the reactivity of the core in dollars.”

“The safety protocols required the reactor to maintain a reactivity level well below one dollar to prevent a prompt critical excursion.”

C2 · Proficiency Countable noun British English · Archaic · Informal

n. an old British name for a coin worth five shillings.

n. a historical British colloquialism for a crown or a five-shilling coin, worth one-quarter of a pound.

“My grandfather told me that a dollar used to buy a lot of food.”

“Before decimalisation in 1971, it was common for Londoners to refer to a five-shilling piece as a dollar.”