The word "一块儿" is formed by combining the numeral "一" (meaning "one") with the measure word "块" (meaning "piece" or "unit"), and appending the suffix "儿" (a retroflex ending used in colloquial Northern Chinese dialects). This combination literally translates to "one piece", but functionally it serves as an adverb meaning "together" or "in the same place", derived from the idea of being in one unit or group.