'appearer' originates from English, formed by adding the agentive suffix '-er' to the verb 'appear' (from Middle English 'aparen'/'apparen'), where 'appear' came into English from Old French and ultimately from Latin 'apparēre' meaning 'to appear'.

'appearer' developed by adding '-er' to Middle English forms of 'appear' (from Old French 'aparoir/aparer' and Latin 'apparēre'), and became the English noun 'appearer' meaning 'one who appears.'

Initially, the root verb meant 'to come into view' (from Latin 'apparēre'), and the noun formed with '-er' has kept the core sense of 'one who comes into view or makes an appearance,' with specialized use in legal contexts.