Here's what it means:
Third-person narration is a way of telling a story from the perspective of an outside observer. The narrator uses pronouns like "he," "she," "it," and "they" to refer to the characters. There are several sub-types:
* Third-person omniscient: The narrator knows everything about all the characters, their thoughts, feelings, and past experiences.
* Third-person limited: The narrator knows the thoughts and feelings of only one character, providing a more intimate view of the story.
* Third-person objective: The narrator acts like a camera, simply recording events and dialogue without providing any insights into the characters' minds.
Examples:
* Third-person omniscient: "He was a lonely man, haunted by the ghosts of his past. She, however, was full of life and laughter, oblivious to the pain that lurked within him."
* Third-person limited: "She felt a flutter of nervousness as she approached the stage. Would they like her performance? Would they even pay attention?"
* Third-person objective: "He walked into the room, his face pale and drawn. She sat at the table, stirring her tea slowly. The silence between them was thick and heavy."
To answer your question more directly, "reading in third person" would mean reading a story told using a third-person narration technique.
If you meant something else, please clarify your question and I can give you a more specific answer.