Pronunciation: [ɒvwˈɪt͡ʃ] (IPA) 
The spelling of the word "of which" is straightforward once you understand its pronunciation. It's pronounced "uhv wich" in American English and "uhv wɪtʃ" in British English. The "o" in "of" is pronounced as an unstressed "uh" sound, while the "w" in "which" is pronounced with a short "ih" vowel sound. In writing, it's essential to use the correct spelling of "of which" to avoid confusion and make your writing clear and concise.
"Of which" is a phrase commonly used in English language, particularly in formal and academic contexts. It is often used to introduce a relative clause that provides additional information about a preceding noun or pronoun.
The phrase "of which" is used to refer to a particular subset or a specific element among a larger group or category. It introduces a phrase that further explains or specifies the main subject or object. It is mainly used to avoid repetition or to provide more clarity in a sentence.
For example, consider the sentence: "She has three siblings, two of which are doctors." Here, the phrase "of which" is used to clarify that two out of the three siblings are doctors. The phrase "of which" directly refers to the "siblings" mentioned earlier.
In essence, "of which" is a phrase that serves as a connecting link between the larger group or category and the specific subset being discussed. It acts as a bridge to provide specific details or context about the subject or object in question. Its purpose is to enhance clarity and provide additional information in a concise and efficient manner.
The word "of which" can be broken down into two components: "of" and "which".
1. "Of" comes from Old English "of" or "off" and is derived from the Proto-Germanic word "af" meaning "away, off". It has roots in the Old High German "ab", Old Norse "af", and Gothic "af" as well.
2. "Which" has Middle English origins and is derived from the Old English word "hwilc", which meant "who, which". The Old English "hwilc" comes from Proto-Germanic "hwi-lik-" meaning "from what source".
When combined, "of which" retains the meaning of "from what source or from which", with "of" expressing possession or belonging, and "which" indicating the specific item or group being referred to.
