Understanding In-Phase and Definite-Phase Relationships

[Icy98]

I'm confused about in phase and definite phase relationships.

Please correct me if I am wrong.
1. Two waves of 360 degree phase difference are in phase.
2. Two waves that are 180 degree out of phase are classified as having definite phase relationships.

 

[anorlunda]

Your question as phrased is not about physics, rather the definition of the word definite. If the phrase relationship was indefinite, the phrase could be any angle.

Definite: clearly stated or decided; not vague or doubtful.

 

[sophiecentaur]

The "definite" phase for two waves with 360 degrees difference is zero degrees. That is as definite as any value. (38 degrees or 151 degrees).
I think you are looking for a problem that isn't there.