Therefore; for that reason. Used to show that something logically follows from what was just said.
From Latin 'ergo' meaning 'therefore' or 'hence.' The word comes from a combination of the prefix 'er-' (meaning 'out') and 'ago' (meaning 'to drive'), literally meaning 'to drive out' or 'to bring forward as a conclusion.' It entered English through logical and philosophical texts during the Medieval period.
This word is the logical glue that holds arguments together—it's so fundamental to reasoning that it appears constantly in math proofs, philosophy papers, and legal arguments. The phrase 'I think, therefore I am' (Cogito, ergo sum) by Descartes is arguably the most famous use of 'ergo' in history, and it became the foundation for all modern philosophy!
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