The spelling of the word "advize" can be explained using the International Phonetic Alphabet (IPA). The "a" in "advize" is pronounced as the short "a" sound /æ/, which is followed by the voiced "d" sound /d/. The "v" is pronounced as the voiced "v" sound /v/ and the "i" is pronounced as the long "i" sound /aɪ/. Lastly, the "z" is pronounced as the voiced "z" sound /z/. While "advize" is a variant spelling of "advise", it is not commonly used and is considered incorrect in standard English.
The word "advize" is derived from the Middle English word "advisen" which comes from the Old French word "aviser". It ultimately traces back to the Latin word "advisare" meaning "to consider" or "to deliberate". Over time, "advisen" evolved into "advise" in Modern English and it typically refers to giving guidance, recommendations, or suggestions to someone.