Dictionary.net

• a clause in a complex sentence that cannot stand alone as a complete sentence and that functions within the sentence as a noun or adjective or adverb

2006 - WordNet 3.0
By Princeton University

• a clause in a complex sentence that cannot stand alone as a complete sentence and that functions within the sentence as a noun or adjective or adverb

2011 - English Dictionary Database
By DataStellar Co., Ltd