Questions & Answers about Es un gran día.
Gran is a shortened form of grande.
In Spanish, some adjectives drop a syllable when they come before a singular noun. This is called apócope (shortening). Grande becomes gran before any singular noun, masculine or feminine:
- un gran día – a great day
- una gran ciudad – a great city
If the adjective goes after the noun, you keep the full form grande:
- un día grande
- una ciudad grande
So you say un gran día, not un grande día.