An

The indefinite article 'an' is used before singular nouns that begin with a vowel sound (a, e, i, o, u) or silent 'h'. It indicates a non-specific or unidentified member of a group or category. It signals the listener or reader isn't aware of the item. Its purpose is to introduce a singular, unspecified entity. It differentiates itself from the definite article 'the' which is used for specific and identifiable items or ideas.

An meaning with examples

• I saw an eagle soaring high in the sky during my hike. The eagle was a majestic bird, and I'd never seen an eagle so close before. This bird was an incredible sight, especially since an experienced birdwatcher taught me about them.
• She wanted to read an interesting book before bed. She chose an intriguing mystery novel which had an unexpected plot twist. She hoped to find an escape in it and forget the stresses of her day.
• My dog loves an apple for a snack, especially after an exciting game. He devours an apple quickly with an impressive speed. He would eat an unlimited amount of apples if he could.
• We decided to eat an early lunch at an Italian restaurant. The menu described an amazing pizza with an extra serving of cheese. an entree like that sounded delicious.