parenthesis

noun

pa·​ren·​the·​sis pə-ˈren(t)-thə-səs 

plural parentheses pə-ˈren(t)-thə-ˌsēz 

1

a

: an amplifying (see amplify sense 1) or explanatory word, phrase, or sentence inserted in a passage from which it is usually set off by punctuation

explained further in a parenthesis

b

: a remark or passage that departs from the theme of a discourse : digression

The speaker inserted some often amusing parentheses during his speech.

2

: interlude, interval

The parenthesis of war interrupted the course of his life.

3

: one or both of the curved marks ( ) used in writing and printing to enclose a parenthetical expression or to group a symbolic unit in a logical or mathematical expression

The plant's common name is followed by its Latin name in parentheses.

Synonyms of parenthesis

• interval
• interruption
• hiatus
• pause
• gap

Examples of parenthesis in a Sentence

there was a parenthesis of silence when the microphone momentarily lost power

Recent Examples on the Web

Here’s a rundown of other transfers who should make a major impact this season (former schools in parentheses). — Steve Megargee, Chicago Tribune, 12 Aug. 2026

Their ages as of the start of next season are in parentheses. — Zach Harper, New York Times, 4 Aug. 2026

Where else could Alfred, Lord Tennyson, share a parenthesis with Ed Sheeran and the Foo Fighters? — Anthony Lane, New Yorker, 3 Aug. 2026

The tutor recognized the expression, asked him to clarify his parentheses, and guided him through a second application of the difference-of-squares pattern. — Ray Ravaglia, Forbes.com, 21 July 2026

Word History

Etymology

Late Latin, from Greek, literally, act of inserting, from parentithenai to insert, from para- + en- en- + tithenai to place — more at do

First Known Use

1548, in the meaning defined at sense 1a

Kids Definition

parenthesis

noun

pa·​ren·​the·​sis pə-ˈren(t)-thə-səs 

plural parentheses -thə-ˌsēz 

1

: a word, phrase, or sentence inserted in a passage to explain or comment on it

2

: one of a pair of marks ( ) used to enclose a parenthesis or to group units in a mathematical expression

parenthetic

ˌpar-ən-ˈthet-ik

adjective

or parenthetical

-ˈthet-i-kəl

parenthetically

-i-k(ə-)lē 

adverb