1. in a way that has the same or nearly the same meaning; interchangeably

Examples

• The terms ‘happy’ and ‘joyful’ are often used synonymously.
• In casual conversation, ‘car’ and ‘automobile’ function synonymously.
• The words ‘big’ and ‘large’ can be used synonymously in most contexts.
• Many people use ‘website’ and ‘homepage’ synonymously, though they have different meanings.
• The professor explained that ‘effect’ and ‘affect’ cannot be used synonymously.
• In this region, ‘soda’ and ‘pop’ are used synonymously to refer to carbonated drinks.