The term 'each one' can be broken down into three separate words: APIECE (6 letters), ALL (3 letters), and EVERY (5 letters). APIECE is an adverb meaning 'separately or individually, ' while ALL is a pronoun meaning 'the whole amount or quantity.' Finally, EVERY is an adjective meaning 'each and EVERY one without exception.' Together, these three words form the phrase 'each one, ' which is used to refer to each individual item or person in a group.