Pronunciation: [mˈə͡ʊst sˈɛldəm] (IPA) 
The phrase "most seldom" is spelled using the standard English spelling rules. The word "most" is spelled as it sounds, with the long "o" sound /moʊst/. The word "seldom" is spelled with the letter "d" at the end, indicating the past tense of the verb "seldom," even though it is commonly used as an adverb. Its pronunciation is /ˈsɛldəm/. Together, "most seldom" means the least common or rarest occurrence of something.
Most seldom refers to something that occurs or happens with the highest degree of infrequency or rarity. It is an expression used to emphasize the extreme scarcity or uncommonness of a particular occurrence, event, or situation.
The term "most" indicates a superlative degree, denoting the highest level or extent of something. In this case, it emphasizes the extremity of the infrequency being described. The word "seldom" means not often, rarely, or infrequently, suggesting a lack of regularity or frequency.
When combined, "most seldom" emphasizes that the described subject has an exceptionally low level of occurrence, happening only very rarely or almost never. It highlights that the event or situation being described is highly exceptional or completely atypical.
For example, "winning the lottery is a most seldom experience" means that winning the lottery is an extremely rare occurrence, happening to only a few people in an overwhelmingly small number of cases.
In summary, "most seldom" is an expression used to stress the remarkable infrequency or rarity of an event, phenomenon, or situation, further highlighting its extraordinary or unusual nature.
The phrase "most seldom" is not a word with a specific etymology. "Most" is a superlative adverb indicating the highest degree or extent, while "seldom" is an adverb meaning infrequently or rarely. When used together, "most seldom" means something that occurs very rarely or almost never. However, as it is a combination of two separate adverbs, it does not have a unique etymological origin.
