Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “jack”

jack

noun [C]  /dʒæk/ us  

jack noun [C] (DEVICE)

a device used to raise and hold something heavy off the ground, esp. one for raising a vehicle so that a tire can be changed

jack noun [C] (CARD)

a playing card that has a picture of a man on it and has a lower value than the cards showing a king or queen: the jack of diamonds

jack noun [C] (ELECTRICITY)

a hole into which a wire connected to a piece of electrical equipment can be plugged so that the equipment can operate: a microphone jack
(Definition of jack from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of jack?
Add Cambridge dictionaries to your browser to your website

Definitions of “jack” in other dictionaries

Word of the Day

first:

(a person or thing) coming before all others in order, time, amount, quality, or importance

Word of the Day

Countability – grammar codes

by Dom Glennon​​,
November 26, 2014
Advices and informations Have you ever noticed strange codes in square brackets on entries in Cambridge Dictionaries Online and wondered what they mean? These are grammar codes, giving you a brief summary of how that word behaves grammatically. More information can be obtained by hovering your cursor over the code, and there’s

Read More 

ped-text verb

November 24, 2014
to text someone while walking I’m ped-texting, I’m looking down at my phone, 75 percent of the time.

Read More