Anticipatory plagiarism occurs when someone steals your original idea and publishes it a hundred years before you were born.

We can say nothing but what hath been said . . . Our poets steal from Homer . . . . Our storydressers do as much; he that comes last is commonly best.

They had their lean books with the fat of others' works.

I get a lot of big ideas, and occasionally I actually come up with one myself.

Immature poets imitate; mature poets steal.

The similarity of thoughts or the point of view between the two persons may appear a case of like-mindedness, but the fact could be one is trying to snatch the credit of others for own selfishness.