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Oneness

"He is now one with the Force."

Oneness was the state of union with the Force. While under normal circumstances this could only be achieved after a Force-sensitive had died and passed into the Netherworld of the Force, this was not always the case. In some select circumstances living individuals managed to become an extension of the Force. They essentially became nothing more than an extension (a tool) of the Force, and were at a perfect calm.

Some Force-sensitives who achieved this include:

Anakin Skywalker: During the Battle of Praesitlyn, and on the planet Mortis while resurrecting Ahsoka Tano using the Daughter's last powers before her death.
Barriss Offee: After she had injected herself with bota, she experienced a state of oneness with the Force that she described as being in all times, all places, and all things. She is recorded as doing this on two separate occasions, and both times entered this state as a result.
Jax Pavan: After escaping a confrontation with Darth Vader, he momentarily experienced the same state of being that Barriss Offee had. In the absence of any conscious effort to bring it about, he concluded that it was the will of the Force that had made it possible, reassuring him that he was doing the right thing.
Anakin Solo: On the Myrkr mission against the Yuuzhan Vong.
Ganner Rhysode: In captivity on Coruscant he managed to single-handedly hold off and kill several thousand Yuuzhan Vong warriors before finally collapsing the roof of the Senate Hall to wipe out the rest of the Yuuzhan Vong forces and their battle creatures.
Luke Skywalker: On the way to confront Supreme Overlord Shimrra he slew countless Yuuzhan Vong as well as many Slayers in a state that was described by his nephew Jacen as a maelstrom of luminous Force energy that poured from a calm center. It was a maelstrom in which Luke did not appear to be present either physically or as an individual personality, having completely surrendered himself to the will of the Force.
Jacen Solo: In the final battle of the Yuuzhan Vong War, Jacen achieved a total oneness with the Force, becoming a being of glowing light. When he returned to his normal form, Jacen did not perceive it possible for him to ever achieve oneness again.