noun

JIT

jit, or jay-eye-TEE

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JIT (noun) means a young person, especially a kid or teenager seen as inexperienced; common in US hip-hop and Southern slang. Example: “The jits outside were arguing over a bike.”

noun

slang A young person, especially a kid or teenager seen as inexperienced; common in US hip-hop and Southern slang.

"The jits outside were arguing over a bike."

"He's still a jit, he'll learn."

abbreviation

computing Just-in-time: a way of compiling computer code into machine instructions while a program is running, rather than beforehand, so that it executes faster.

"The JIT compiler optimises hot loops after a few thousand iterations."

"Turning off the JIT made the benchmark five times slower."

business Just-in-time: a manufacturing and stock-control method in which materials arrive only as they are needed, keeping inventory to a minimum.

"JIT delivery keeps warehouse costs down but leaves no cushion for delays."

"The pandemic exposed the fragility of JIT supply chains."

How to use JIT

Learner’s notes

In plain EnglishDoing or delivering something at the exact moment it is needed, not in advance.

When to use it

Technical shorthand. Spell out just-in-time on first mention outside a specialist audience.

Memory tip

As a modifier before a noun the spelled-out form is hyphenated: just-in-time compilation, just-in-time delivery.

Trace the full origin ↓

Easily confused with

JIT vs AOT JIT vs just-in-case inventory

Common pairings

JIT compiler JIT compilation JIT manufacturing JIT inventory JIT delivery

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C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

Test yourself on “JIT” A quick quiz — meaning, synonyms & usage →

Fill the gap

Can you complete this real example?

The _____ outside were arguing over a bike.

Etymology

In the slang sense, US regional (Florida and the South), of uncertain origin. In the technical senses, an initialism of 'just in time'.

Origin: English

Synonyms

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youngster kid shorty

Antonyms

just-in-case

Related words

Children girl child boy kid minor Josh teen

Frequently asked questions

What is the difference between JIT and AOT compilation?

AOT (ahead-of-time) compilation turns source code into machine code before the program runs, giving fast startup and predictable performance. JIT compiles during execution, which costs startup time but lets the compiler optimise based on what the program actually does.

What does JIT mean in manufacturing?

It means parts and materials are ordered to arrive exactly when the production line needs them, so almost nothing sits in storage. It cuts holding costs but makes the operation vulnerable to supply disruption.

Is JIT the same in software and business?

The underlying idea is the same — do the work at the last responsible moment — but the fields are unrelated in practice. Context makes it clear which is meant.

What is the meaning of JIT?

"JIT" (noun) means a young person, especially a kid or teenager seen as inexperienced; common in US hip-hop and Southern slang.

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Children girl child boy kid minor Josh teen