An object is a noun which receives the action of a verb or verbal. It is in accusative case. When it is the object of a verb, it is often called a “direct object;” cf indirect object. An object is found by asking “what?”
Jeb built a house.
Ask yourself…”Jeb built what?” Jeb built a house. Hence, “house” is the object of the verb “built”.
Greek:
An object is in the accusative case.
Hebrew:
An object is often marked out by the object marker word. Direct objects can also be attached directly to their verb by way of a suffix; see this overview or the video instruction here and here.