A unit of time
Encoding Strategies:
linguistic

hour
hour
+
-a
noun suffix
Hora means hour and is a direct cognate of the English word.
hora
hour
A period of 60 minutes.
El vuelo dura tres horasThe flight lasts three hours
Esperé más de una hora en la filaI waited more than an hour in line
time
Hours are used to tell time, so hora also asks for the current hour (i.e. time of day).
¿Qué hora es?What time is it? (What hour is it?)
Ya es hora de dormirIt's time to go to sleep (It's already the hour of sleeping)
appointment, scheduled meeting (Spain)
Refers to a scheduled appointment, because you are reserving a specific hour of someone's time.
Tengo hora con el médico a las diezI have an appointment with the doctor at ten (I have an hour with the doctor at 10)
¿Puedo pedir hora para mañana?Can I make an appointment for tomorrow? (Can I ask for an hour tomorrow?)