How could we say it is a "object" by the definition?

[Nanu1]

The Object is a noun or a pronoun that receives an action in a sentence. There are three types namely Diect object,Indirect object and Object of a preposition.

Both direct object and indierct obect receives the action in a sentence. But I have a doubt in "object of a preposition". If there is no receiving action in "the object of the preposition" then how could we say it is a "object" by the definition?

 

[Matthew Wai]

In English grammar, an object is a noun, noun phrase, or pronoun that is affected by the action of a verb (a direct object or an indirect object) or that completes the meaning of a preposition (the object of a preposition).

Source: https://www.thoughtco.com/object-in-grammar-1691445