WordWeb Online

1. Grow vigorously
   "The deer population in this town is thriving";
   - boom, flourish, expand
    
2. Make steady progress; be at the high point in one's career or reach a high point in historical significance or importance
   "The new student is thriving";
   - prosper, fly high, flourish, bloom, flower

Derived forms: thriven, thrived, thrives, throve, thriving

Type of: change state, grow, turn

Encyclopedia: Thrive