parent node (in a tree)

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A parent node $P$ of a node $C$ in a tree is the first node which lies along the path from $C$ to the root of the tree, $R$ .

Drawn in the canonical root-at-top manner, the parent node of a node $C$ in a tree is simply the node immediately above $C$ which is connected to it.

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Figure: A node (blue) and its parent (red.)

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