From the Linguistic Glossary: An immediate constituent is any one of the largest grammatical units that constitute a construction. In the complex noun phrase the dog that killed the cat, each of the following items are immediate constituents : the dog that killed the cat An ultimate constituent is one of the grammatically irreducible units that constitutes a construction. In the construction the dog that killed the cat, the following are ultimate constituents : the dog that kill -ed the cat
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