Dictionary.com
Thesaurus.com
Synonyms

in-service

American  
[in-sur-vis, in-sur-] / ɪnˈsɜr vɪs, ˈɪnˌsɜr- /

adjective

  1. taking place while one is employed.

    an in-service training program.
in-service British  

adjective

  1. denoting training that is given to employees during the course of employment

    an in-service course
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of in-service

First recorded in 1925–30

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

All in-service 737 MAX airplanes will be able to continue operating safely.

From Barron's • Mar. 11, 2026

In February 2025 the UK NSC approved an "in-service evaluation" - a pilot screening programme - to gather UK-specific data.

From BBC • Jan. 5, 2026

Fixes were required on about 6,000 aircraft—or more than half of the in-service fleet—before their next flight.

From The Wall Street Journal • Dec. 1, 2025

“Airbus has consequently identified a significant number of A320 Family aircraft currently in-service which may be impacted,” the statement continued.

From MarketWatch • Nov. 28, 2025

But Calista paid the ticket man for both our tickets, and when he gave me a funny look, she said, “School in-service day.”

From Absolutely Almost by Lisa Graff

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.