COS Meaning of COS in English I cos 'because' BrE AmE kəz kəs , occasional strong form kɒz kɒs AmE kɑːz kɔːzII cos 'cosine' BrE AmE kɒz kɒs AmE kɑːs III cos 'lettuce' BrE AmE kɒs kɒz AmE \ kɑːs koʊs Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012