The compound adjective 'two-career' is a modern formation, directly combining the numeral 'two' and the noun 'career'. The word 'two' originates from the Proto-Indo-European root dwóh₁, a fundamental numeral that gave rise to its equivalents in numerous languages, including Latin 'duo' and Greek 'duo'. 'Career' evolved from the Latin 'carrus' (a wheeled vehicle), through the notion of a racing course or a path, to its modern sense of a person's professional life course. Thus, 'two-career' logically constructs its meaning by specifying a situation involving two such professional life paths, typically within a single household.

Structure: two (numeral) + career (noun) - two: From Old English 'twā', of Germanic origin; related to Dutch 'twee' and German 'zwei', from an Indo-European root shared by Latin 'duo' and Greek 'duo'. Functions as a numeral modifier. - career: From French 'carrière', from Italian 'carriera', based on Latin 'carrus' meaning 'wheeled vehicle'. Functions as the core noun denoting a professional occupation or course of life.