Speech is the vocalised form o human communication. It is based upon the syntactic combination o lexicals an names that are drawn frae very lairge (uisually aboot 10,000 different wirds) vocabularies. Each spoken wird is creatit oot o the phonetic combination o a leemitit set o vowel an consonant speech soond units. These vocabularies, the syntax which structurs them, an thair set o speech soond units differ, creatin the existence o mony thoosands o different teeps o mutually unintelligible human leids. Maist human speakers are able tae communicate in twa or mair o them, hence bein polyglots. The vocal abilities that enable humans tae produce speech an aa provide humans wi the ability tae sang.
- Tucker, G. Richard (1999). "A Global Perspective on Bilingualism and Bilingual Education" (PDF). Carnegie Mellon University. Archived frae the original (PDF) on 24 Apryle 2014. Retrieved 23 Apryle 2012.()