This mixed methods study sought to identify how teachers define successful edtech implementation and how their definitions of success vary. We analyzed 825 teacher definitions and identified 28 unique indicators teachers used to define successful edtech implementation that fall into two categories: "conditions" and "outcomes." Teachers' definitions most consistently varied significantly by the site at which they work and several other context and teacher characteristics, including the school percent of Black or Hispanic students, the school level taught, teaching STEM, teachers' years of experience, and teachers' technology beliefs. By understanding how teachers define edtech implementation success, we can better structure their self-reporting on success and ensure educators' definitions of success align with best practices for technology implementation.