an nhon
A1universal
Definition
Meaning
indefinite article used before singular countable nouns when the noun is mentioned for the first time or is non-specific
Used before words beginning with a vowel sound; one (in expressions of quantity); per (in rates); a certain (referring to someone unknown)
Linguistics
Semantic Notes
Used with singular countable nouns only; contrasts with definite article 'the'; 'a' and 'an' are allomorphs determined by phonetic environment
Dialectal Variation
British vs American Usage
Differences
No significant semantic differences. Occasional variation in 'an historic' (UK) vs 'a historic' (US) before aspirated 'h'.
Connotations
In UK English, 'an' is sometimes retained before weakly aspirated 'h' in words like 'historic', 'hotel', 'herb' (UK: 'an herb', US: 'a herb').
Frequency
Equally frequent in both varieties; minor pronunciation-based variations.
Vocabulary
Collocations
Grammar
Valency Patterns
an + [singular countable noun beginning with vowel sound]such an + [adjective] + [noun]half an + [hour/minute]Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “an apple a day keeps the doctor away”
- “an eye for an eye”
- “once in a blue moon”
Usage
Context Usage
Business
We need an answer by Friday. She's an MBA graduate.
Academic
An analysis was conducted. It was an unexpected result.
Everyday
I'd like an apple. Do you have an umbrella?
Technical
An error occurred in the system. Connect to an Ethernet port.
Examples
By CEFR Level
- I saw an elephant at the zoo.
- She is an engineer.
- Can I have an orange, please?
- It was such an exciting opportunity that I couldn't refuse.
- He completed the task in an hour.
- We need an effective solution.
- An analysis of the data revealed several anomalies.
- She made an honest mistake in her calculations.
- It was deemed an unprecedented success.
- The company is facing an existential crisis amid the market downturn.
- His argument presented an elegant solution to a long-standing philosophical dilemma.
- They conducted an exhaustive review of all pertinent literature.
Learning
Memory Aids
Mnemonic
'An' before a vowel sound – 'An elephant ate an orange at an unusual hour.'
Conceptual Metaphor
INTRODUCTION/UNSPECIFIED ENTITY (an opener, a gateway to new information)
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- No direct equivalent in Russian; learners often omit articles entirely or use them incorrectly with non-countable nouns.
- Confusion with 'one' (один) – 'an' is indefinite, not numerical.
Common Mistakes
- Using 'an' before words beginning with consonant sounds (e.g., 'an university'), omitting 'an' before singular countable nouns, overusing with plural/non-count nouns.
Practice
Quiz
Which is correct?
FAQ
Frequently Asked Questions
Use 'a' before consonant SOUNDS, 'an' before vowel SOUNDS. It's about sound, not spelling (e.g., 'a university' /j/, 'an hour' /aʊ/).
No, 'a/an' are only used with singular countable nouns. For plural or uncountable nouns, use 'some', 'any', or no article.
Yes, based on the SOUND of the first letter when spoken. 'An FBI agent' (eff-bee-eye), 'a NASA scientist' (en-ay-ess-ay).
Some UK speakers use 'an' before weakly aspirated /h/ in words like 'historic', 'hotel', treating them as vowel-initial. This is less common in modern US English.