The word 一连 is formed by combining the character 一, meaning "one", with 连, meaning "link" or "connect". This combination creates an adverb that denotes a continuous sequence or succession starting from a single point, as seen in its usage to indicate events happening repeatedly or in an unbroken row, such as in 一连三天 meaning "for three days in a row". The formation directly derives from the literal meanings of the individual characters to express the idea of things being connected in a series beginning with one.