organizer

noun

or·​ga·​niz·​er ˈȯr-gə-ˌnī-zər 

plural organizers

1

: a person or thing that organizes something: such as

a

: a person who arranges something (such as an event) especially by systematic planning and by coordinating the efforts of others

the organizers of the festival

Community organizers have scheduled other events around the city this weekend to celebrate Martin Luther King Jr. Day. For example, on Sunday the Town Hall will host "Writers Resist," at which more than a dozen writers will read their own work and pieces from celebrated American rights activists.

—Jessica Lee

b

: something (such as a device or container) that is designed to keep objects or information in a particular arrangement or order

a closet organizer

The digital diary a.k.a the electronic organizer was popular in the '80s and '90s. It was a calculator, address book and notepad all-in-one.

—Rill Causey and Sam Reichman

We discovered that one of the firms still mailed tax organizers to clients in January. While they didn't really expect their clients to fill out the paper organizers, they knew the document remained an effective way of reminding clients to start getting organized well before April 15—and to keep the firm's brand top of mind.

—Kyle Walters

2

: a region of a developing embryo or a substance produced by such a region that is capable of inducing a specific type of development in undifferentiated tissue

called also inductor

Examples of organizer in a Sentence

Recent Examples on the Web

Alyssa Leiva, a community organizer with Stockton Stands, spearheaded a petition to remove Cesar Chavez from all public facilities in Stockton. —Charlie Lapastora, CBS News, 31 Mar. 2026

Several countries, including Spain, Ireland, Slovenia, Iceland and the Netherlands, are boycotting this year’s primary event — to be held in Vienna in May — after organizers allowed Israel to participate despite calls to ban the country over the war in Gaza. —Lex Harvey, CNN Money, 31 Mar. 2026

Back in 2022, organizers put on the American Song Contest, which featured singers from all 50 states and hosts Kelly Clarkson and Snoop Dogg. —Gil Kaufman, Billboard, 31 Mar. 2026

For organizers, the goal was not just to create a single day of visibility, but to strengthen something ongoing. —J.m. Banks march 31, Kansas City Star, 31 Mar. 2026

Word History

First Known Use

1786, in the meaning defined at sense 1

Phrases Containing organizer

• co-organizer
• nucleolus organizer

Rhymes for organizer

• advertiser
• analyser
• analyzer
• appetizer
• atomizer
• breathalyzer
• colonizer
• crystallizer
• digitizer
• equalizer
• fertilizer
• localizer

Medical Definition

organizer

noun

or·​ga·​niz·​er

variants also British organiser

-ˌnī-zər 

1

: one that organizes

2

: a region of a developing embryo (as the chordamesoderm of the dorsal lip of the vertebrate blastopore) or a substance produced by such a region that is capable of inducing a specific type of development in undifferentiated tissue

called also inductor