hola
A friendly greeting meaning "hello" or "hi."
Definitions
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1
Used to greet someone in an informal or neutral context — equivalent to 'hello' or 'hi' in English.
“Cuando llegó a la oficina, dijo hola a todos sus compañeros.”
When she arrived at the office, she said hello to all her coworkers.
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2
Used to attract someone's attention or express surprise, similar to 'hey' in English.
“¡Hola, espera un momento y te explico el camino!”
Hey, wait a moment and I'll explain the way to you!
Universally used across all Spanish-speaking regions and age groups. It works in both informal and semi-formal contexts, though very formal situations may call for "buenos días / buenas tardes / buenas noches" instead.