index

C1 · Advanced Countable noun Economics Academic · Technical

n. a system or number used to measure and compare changes in things like prices or wages.

n. a statistical measure of change in an economy or a securities market, often expressed as a percentage of a base value.

日本語:指数※

“The consumer price index shows how much the cost of living has gone up this year.”

“Economists monitor the stock market index as a proxy for investor confidence and broader macroeconomic stability.”

C1 · Advanced Countable noun Formal · Literary

n. a sign or measure of something else.

n. a sign, token, or indication of a particular situation, quality, or state of affairs.

日本語:指標※

“The number of new houses being built is a good index of the country's wealth.”

“The rapid decline in local bird populations served as a grim index of the overall health of the ecosystem.”

C1 · Advanced Countable noun Computing Technical

n. a key or number used to find a specific piece of information in a computer's memory.

n. a data structure or integer used to locate and access specific elements within an array, database, or file system efficiently.

“The program failed because it tried to access an index that didn't exist in the list.”

“By creating a secondary index on the customer ID column, the database administrator significantly reduced query latency for the web application.”

C1 · Advanced Countable noun Mathematics Technical

n. a small raised number that shows how many times to multiply a number by itself.

n. a number or symbol, often written as a superscript, indicating the power to which a quantity is to be raised.

“In the expression 10 to the power of 3, the number 3 is the index.”

“Students must learn the laws of indices before they can solve complex algebraic equations involving roots and powers.”

B2 · Upper Intermediate

v. to make an alphabetical list of the topics in a book or document.

v. to record names or topics in an index; to provide a book or document with an index.

“The library is working to index all of its old newspapers so people can search them online.”

“The software automatically indexes every word in the document, allowing for instantaneous full-text searching across the entire archive.”

C1 · Advanced Economics Technical · Formal

v. to link wages or prices to a system so they change automatically when costs go up.

v. to adjust a value, such as a salary or interest rate, automatically according to changes in a price index.

“The government decided to index pensions to inflation to help retired people.”

“The union negotiated a contract where annual pay increases are indexed to the national cost-of-living adjustments.”