Here are the most common meanings:
In semiotics:
* The concept or idea that a sign represents. For example, in the word "tree," the signified is the concept of a tall, woody plant with branches and leaves. The word "tree" is the signifier.
In general use:
* To mean or indicate something. For example, "The smoke signified a fire."
* To make known or express. For example, "His silence signified his disapproval."
In essence, signified refers to the meaning or concept behind a sign, symbol, or action.