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Meaning of labeled bracketing

la'beled brack'eting

Pronunciation: [key]
— Ling. Ling.
  1. a representation of the constituent structure of a string, as a word or sentence, comparable to a tree diagram, in which each constituent is shown in brackets and given a subscript grammatical label, with each bracketed item corresponding to a node in a tree diagram.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.