1. something that makes a situation more difficult or complex
2. a secondary disease or condition that develops during the course of a primary illness
Usage: medical
3. the state of being complicated or complex

Examples

• The rain was an unexpected complication for our outdoor wedding.
• She developed pneumonia as a complication of the flu.
• The new regulations added another complication to the hiring process.
• His injury healed without any complications.
• The complication of the legal case made it drag on for months.
• We tried to avoid complications by planning everything in advance.
• The surgery went well, but there was a minor complication afterward.