the word "tomorrow" originates from the old english phrase "to morgenne," meaning "on (the) morrow." this phrase itself is a combination of the preposition "to" (meaning "at, on") and "morgen," the dative case of "morgen," which meant "morning" or, by extension, "the following day." the modern spelling solidified in middle english as "to morwe" or "tomorwe," reflecting the common elision of the preposition and noun into a single lexical unit. the core logic is temporal progression: "at the morning" of the next day, which evolved to signify the entire 24-hour period following the current day.

the word is a simplex unit derived from old english. it cannot be meaningfully segmented into modern english morphemes that are direct substrings of the current spelling while retaining clear semantic components.