'seceder' originates from Latin, specifically the verb 'secedere,' where 'se-' meant 'apart' and 'cedere' meant 'to go'; the English noun 'seceder' is formed from the verb 'secede' + agent suffix '-er'.

'seceder' changed from the English verb 'secede' (from Latin 'secedere') — Latin 'secedere' was adopted into English as 'secede' (17th century usage), and the agent noun 'seceder' later formed by adding '-er' to denote 'one who secedes'.

Initially it carried the literal sense 'to go apart, withdraw,' and it evolved into the modern sense referring to a person who withdraws from an organization or political body.