opening

noun

open·​ing

ˈōp-niŋ, 

ˈō-pə- 

1

a

: an act or instance of making or becoming open

b

: an act or instance of beginning : commencement

especially : a formal and usually public event by which something new is put officially into operation

2

: something that is open: such as

a(1)

: breach, aperture

(2)

: an open width : span

a three-inch opening

b

: an area without trees or with scattered usually mature trees that occurs as a break in a forest

c

: two pages that face one another in a book

3

: something that constitutes a beginning: such as

a

: a usually planned series of moves made at the beginning of a game of chess or checkers compare endgame, middle game

b

: a first performance

attended the play's opening

4

a

: occasion, chance

She was waiting for an opening to tell her story.

b

: an opportunity for employment

The department has several openings.

Synonyms of opening

• opportunity
• chance
• room

Examples of opening in a Sentence

the opening of a cave

They squeezed through a narrow opening between the fence and an oak tree.

The enemy's troops poured through an opening in our defenses.

We went to the play's opening.

Recent Examples on the Web

Another example came in the United States’ opening match with Paraguay, when the VAR protocol on mistaken identity was rewritten in real time by the match officials. — Graham Scott, New York Times, 22 July 2026

In his opening remarks, Mast noted that Haiti lies 700 miles from Florida and terrorist organizations effectively control the capital. — Jacqueline Charles, Miami Herald, 22 July 2026

Half of the film’s North American opening-weekend audience chose a premium large format (PLF), including 23% who chose IMAX. — David Deal, Forbes.com, 21 July 2026

The structure also supports the kind of smooth, repeatable opening and closing action that many EDC enthusiasts value, whether the knife is being used for a quick package opening or carried as a tactile mechanical object throughout the day. — New Atlas, 21 July 2026

Word History

First Known Use

13th century, in the meaning defined at sense 1a

Phrases Containing opening

• cold opening
• grand opening
• opening crawl
• opening gambit
• opening hours
• opening night
• pre-opening

Rhymes for opening

• reopening

Kids Definition

opening

noun

open·​ing ˈōp-(ə-)niŋ 

1

: an act or instance of making or becoming open

the opening of a new store

welcome to our grand opening

2

: something that is open: as

a

: breach entry 1 sense 2b

b

: an open place

an opening in the woods

3

: beginning sense 2

the opening of fishing season

4

a

: occasion entry 1 sense 1, chance

saw an opening to run with the ball

b

: a job opportunity

openings for welders and machinists

Medical Definition

opening

noun

open·​ing ˈōp-(ə-)niŋ 

1

: an act or instance of making or becoming open

2

: something (as an anatomical aperture) that is open or opens