"Once removed" means that there is one generation between you and your cousin(s). For example, your first cousin once removed is the child (or parent) of your first cousin because there is one generation separating them. The same would be true for second and so on cousins once removed, but with second or however many cousins instead of first.
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Cousin Relations
Документальная прозаThis explains the different relations of cousins, such as first, second, and third cousins, removed cousins, and more!