The word "一点" is formed by directly combining the character "一" (yī), meaning "one", with "点" (diǎn), which originally represented a small dot or speck and conveys the idea of a minuscule unit or amount. This combination results in a literal meaning of "one dot", but functionally it is used to indicate a small quantity, such as "a little" or "a bit", where "一" quantifies the minimal scale implied by "点".