1. the conditional clause in a conditional sentence, typically beginning with ‘if’
Usage: grammar
2. the first part of a classical drama that introduces the characters and situation
Usage: literary; classical drama

Examples

• In the sentence ‘If it rains, we’ll stay inside,’ the protasis is ‘If it rains.’
• The protasis establishes the condition that must be met.
• Students often confuse the protasis with the main clause.
• The playwright carefully crafted the protasis to introduce all major characters.
• Ancient Greek dramas typically began with a detailed protasis.
• The protasis sets up the dramatic conflict that will unfold.