'pro-laborism' originates from the prefix 'pro-' (from Latin 'pro' meaning 'for'), the word 'labor' (from Latin 'labor' meaning 'work'), and the suffix '-ism' (from Greek '-ismos' meaning 'practice, doctrine, or ideology').

'labor' entered English (Old French/Latin influence) as 'labour' in Middle English; the suffix '-ism' was later attached to form 'labourism'/'laborism' in the 19th century to denote political movements or doctrines favoring labor; the compound 'pro-laborism' is a modern English formation using the prefix 'pro-' to indicate support for that doctrine.

Originally 'labor' meant 'work' or 'toil'; over time 'labourism'/'laborism' came to mean a political tendency or ideology supporting organized labor, and 'pro-laborism' now specifically denotes support for that movement or its policies.