noun

la reserva

reservation

Cantidad guardada o apartada para usar en el futuro o en caso de necesidad.

The Spanish word "reserva" can be explained as follows:

Meaning

"Reserva" functions both as a noun and a verb (in some forms, from the verb "reservar"), but most commonly as a noun, meaning:

Reservation or booking: Refers to the act of reserving something in advance — such as a hotel room, a seat at a restaurant, or a ticket for travel. For example, "Hicimos una reserva en el restaurante" means "We made a reservation at the restaurant."
Reserve or something kept aside: It can also mean a "reserve" or "stockpile" of resources or items set aside for future use, like a food reserve, financial reserve, or natural reserve (protected area). For example, "La reserva natural" means "the nature reserve."
Caution or reluctance: In a more abstract sense, "reserva" can describe a feeling of hesitation or cautiousness in behavior or speech. In English, this would be "reserve" as a personality trait — being reserved or holding back.

Parts of the Word

The root is "reserv-", related to the idea of keeping or saving.
The suffix "-a" marks it as a noun in Spanish.

Synonyms

For booking/appointment: "cita", "contratación" (less common)
For reserve/stock: "existencia" (stock), "almacén" (storage)
For caution or hesitation: "reticencia", "prudencia", "titubeo"

Antonyms

For reservation: "cancelación" (cancellation)
For reserve (stock): "agotamiento" (depletion)
For cautious reserve (personality): "extraversion", "desinhibición" (lack of inhibition)

Summary

"Reserva" is a versatile word related to the concept of keeping something set aside or protected — either a booked item, an area conserved, or an attitude of prudence.