first-in, first-out: meaning, definition, pronunciation and examples
C2formal, technical
Quick answer
What does “first-in, first-out” mean?
An inventory management and accounting method where assets produced or acquired first are sold, used, or disposed of first.
Audio
Pronunciation
Definition
Meaning and Definition
An inventory management and accounting method where assets produced or acquired first are sold, used, or disposed of first.
A principle of service or queue management where the first items or people to arrive are the first to be processed. It can metaphorically describe any system operating on chronological priority.
Dialectal Variation
British vs American Usage
Differences
No significant difference in core meaning or usage. The term is equally technical in both variants.
Connotations
Neutral, technical, and procedural. Implies fairness, order, and systematic handling.
Frequency
Slightly more frequent in US English due to its prominence in US accounting standards (GAAP).
Grammar
How to Use “first-in, first-out” in a Sentence
The warehouse operates on a [first-in, first-out] system.We value our stock using the [first-in, first-out] method.The tickets were sold on a [first-in, first-out] basis.Vocabulary
Collocations
Examples
Examples of “first-in, first-out” in a Sentence
noun
British English
- The company's accounting policy is strict first-in, first-out.
- We need to maintain a proper first-in, first-out for perishable goods.
American English
- Their inventory system is a pure first-in, first-out.
- The algorithm implements a first-in, first-out for data packets.
adverb
British English
- Goods are processed first-in, first-out.
- The applications will be reviewed first-in, first-out.
American English
- Items are sold first-in, first-out.
- Tickets will be allocated first-in, first-out.
adjective
British English
- They use a first-in, first-out warehouse system.
- Please follow the first-in, first-out rule for these documents.
American English
- We adopted a first-in, first-out approach to client support.
- The first-in, first-out method is required for tax purposes.
Usage
Meaning in Context
Business
Describes inventory costing methods or customer service queue management.
Academic
Used in operations management, computer science (data structures), and accounting textbooks.
Everyday
Rare in casual conversation; might be used to explain how a waiting list works.
Technical
Core term in logistics, supply chain, accounting, and computing (describing a data structure like a queue).
Vocabulary
Synonyms of “first-in, first-out”
Strong
Neutral
Weak
Vocabulary
Antonyms of “first-in, first-out”
Watch out
Common Mistakes When Using “first-in, first-out”
- Using it as an adjective without hyphens (e.g., 'first in first out system' is less standard).
- Confusing it with 'first come, first served', which is for service contexts, not inventory valuation.
FAQ
Frequently Asked Questions
No, it depends on the business and economic climate. FIFO often results in higher reported profits during inflation compared to LIFO.
Yes, it can describe queue management (e.g., a customer service line), though 'first come, first served' is more common in everyday language.
It realistically represents the likely flow of goods (especially perishables) and prevents older stock from becoming obsolete.
It is almost always pronounced as individual letters: 'F-I-F-O' (/ˌɛf aɪ ˌɛf ˈəʊ/).
An inventory management and accounting method where assets produced or acquired first are sold, used, or disposed of first.
First-in, first-out is usually formal, technical in register.
Phrases
Idioms & Phrases
- “First come, first served (conceptual cousin, but not identical)”
Learning
Memory Aids
Mnemonic
Imagine a queue for a concert: the FIRST people IN the queue are the FIRST ones to get OUT and into the venue.
Conceptual Metaphor
A QUEUE or CONVEYOR BELT (items move through a system in the order they arrived).
Practice
Quiz
In which field is 'first-in, first-out' (FIFO) NOT a standard technical term?