base period

American  

noun

1. a period of time used as a standard of comparison in measuring changes in prices, taxes, income, etc., at other periods of time.

---

base period British  

noun

1. statistics a neutral period used as a standard for comparison in constructing an index to express a variable factor: 100 is usually taken as the index number for the variable in the base period

---

Example Sentences

See Examples For:

base period

Notably, Bending Spoons included customers who were nonpaying during the year-earlier base period.

From The Wall Street Journal ● Sep. 11, 2026

The Bureau’s consumer price index average for all items shows that over the past 50 years, the years 1982-84 provide the base period for $100.

From Washington Times ● Jun. 4, 2017

Known as the Integrated Fixed Tower contract, it includes a base period quantity and options that CBP may exercise over several years.

From Reuters ● Mar. 2, 2014

Currently, CBP awarded the base period quantity for a portion of the $145 million total contract amount, to be implemented over one year, Elbit said on Sunday.

From Reuters ● Mar. 2, 2014

New oil encompasses both crude from new discoveries and oil that an existing well produces in excess of its output during a 1973 base period.

From Time Magazine Archive

Random Word

Spin the wheel and learn a new word!

---