semiautomatic

adjective

semi·​au·​to·​mat·​ic ˌse-mē-ˌȯ-tə-ˈma-tik How to pronounce semiautomatic (audio)
ˌse-ˌmī-,
-mi-
: not fully automatic: such as
a
: operated partly automatically and partly by hand
b
of a firearm : able to fire repeatedly through an automatic reloading process but requiring release and another pressure of the trigger for each successive shot
a semiautomatic rifle
semiautomatic noun
semiautomatically adverb

Examples of semiautomatic in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
New Zealand banned military-style semiautomatic weapons and assault rifles months after the attack – the deadliest shooting ever in the country – and strengthened its counterterrorism laws. Karissa Waddick, USA Today, 2 Oct. 2025 But semiautomatic rifles, though used in only seven cases, killed 46 people — more than six per attack, on average. James Densley, The Conversation, 1 Oct. 2025 Police said the investigation uncovered a series of videos, alleged to have been taken in Milpitas by the suspect or an acquaintance, showing a person repeatedly firing an semiautomatic pistol into the air and at a wall. Robert Salonga, Mercury News, 30 Sep. 2025 According to the complaint, both Collins and Robledo carried 9-millimeter semiautomatic pistols to the protests and have lawful permits for the weapons. Bill Kirkos, CNN Money, 29 Sep. 2025 See All Example Sentences for semiautomatic

Word History

First Known Use

1853, in the meaning defined above

Time Traveler
The first known use of semiautomatic was in 1853

Browse Nearby Words

Cite this Entry

“Semiautomatic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/semiautomatic. Accessed 8 Oct. 2025.

More from Merriam-Webster on semiautomatic

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!