Sentence:  "O" is a broad vowel. When <WSD>acuted</WSD>, it is pronounced as "o" in gone; thus, "cron", "son"; when circumflexed, as "o" in bone; thus, "ôney". And thus it answers to the Greek Omicron and Omega. 
Meaning of the word marked with <WSD> tags:  To give an acute sound to.