sign language

noun

1

: any of various formal languages employing a system of hand gestures and their placement relative to the upper body, facial expressions, body postures, and finger spelling especially for communication by and with deaf people

But true sign languages are in fact complete in themselves: their syntax, grammar, and semantics are complete, but they have a different character from that of any spoken or written language.

—Oliver Sacks

Sign language relies mainly on the signer's hand, but facial expressions and body movements are also important.

—Mark Prigg

2

: an unsystematic method of communicating chiefly by manual gestures (as by people speaking different languages)

I decided to cadge a lift from a Lebanese who only spoke Arabic, so we had to converse in sign language.

—Robert Fox

Examples of sign language in a Sentence

Recent Examples on the Web

Lucy and Erin sometimes communicate via sign language to avoid making a sound. —Bilge Ebiri, Vulture, 9 Jan. 2026

Panks, who with his wife started Deafining Cannabis to develop sign language related to the plant, said that instead of focusing on high THC, users should look more into the effects of cannabis terpenes, the compounds that help give cannabis and other plants their distinctive effects. —Robert McCoppin, Chicago Tribune, 5 Jan. 2026

My route out of my hearing loss was learning sign language and entering a deaf community, and thinking about myself as that person. —Georg Szalai, HollywoodReporter, 25 Nov. 2025

Both of her parents were deaf and communicated through sign language. —Makena Gera, PEOPLE, 23 Nov. 2025

Word History

First Known Use

1824, in the meaning defined at sense 1

Rhymes for sign language

• interlanguage
• metalanguage

Kids Definition

sign language

noun

1

: a formal language using a system of hand movements for communication (as by the deaf)

2

: a way of communicating mainly by hand and arm movements as often used by people speaking different languages

Medical Definition

sign language

noun

: any of various formal languages employing a system of hand gestures and their placement relative to the upper body, facial expressions, body postures, and finger spelling especially for communication by and with deaf people