index card

American  

noun

• index cards
  plural

1. a card, often relatively small, as 3 × 5 inches (7.6 × 12.7 centimeters), used in noting or recording information and usually filed in an index.

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Other Word Forms

Noun Inflected Forms

• index cards
  plural

Etymology

Origin of index card

First recorded in 1925–30

Example Sentences

See Examples For:

index card

When the NFL draft begins on Thursday night, Commissioner Roger Goodell will hardly need to glance at an index card to know that the Raiders intended to use the first overall pick on Mendoza.

From The Wall Street Journal ● Apr. 23, 2026

And they had an index card, recently discovered by one of Garcetti’s investigators in the office files, that listed Butler as a D.A. informant.

From Los Angeles Times ● Jun. 28, 2025

I keep a picture of that young boy now in my studio, one I cut out from a newspaper and mounted on an index card.

From Salon ● Mar. 12, 2023

I’m more focused when taking a moment to jot something down, whether it’s making a to-do list and outline in my notebook or creating an up-to-the-minute morning routine on an index card.

From The Verge ● Aug. 3, 2022

We cram it all into a magnetized tin the size of an index card.

From "All The Bright Places" by Jennifer Niven