The word siguiente is an adjective.
/siˈɡjente/
In Spanish, siguiente is primarily used to indicate something that comes after another in sequence or order. It can refer to time (the next day), position (the next person in line), or order (the following chapter). The frequency of use is quite high in both oral and written contexts, but it is especially common in spoken language when discussing sequences or making plans.
El siguiente capítulo del libro es muy interesante.
The next chapter of the book is very interesting.
Por favor, siéntate en la silla siguiente.
Please sit in the next chair.
La siguiente reunión será el próximo lunes.
The next meeting will be next Monday.
While siguiente may not appear frequently in idiomatic expressions by itself, it can be part of phrases that imply continuation or order.
El siguiente paso es firmar el contrato.
The next step is to sign the contract.
Después de eso, vendrá lo siguiente.
After that, the following will come.
No olvides revisar el siguiente punto en la agenda.
Don't forget to check the next item on the agenda.
El siguiente en la lista tiene que esperar su turno.
The next one on the list has to wait for their turn.
The word siguiente comes from the Latin word "sequentem," which means “following” or “that which follows”. The root of the word relates to the action of following or succeeding in order.