1. Complete and comprehensive knowledge or skill in a particular subject, field, or activity, achieved through extensive study and practice
She has an in-depth mastery of classical music theory.
Ela tem um domínio aprofundado da teoria musical clássica.
2. Advanced level of understanding that goes beyond surface-level knowledge
The professor demonstrated his deep expertise in quantum physics.
O professor demonstrou seu domínio aprofundado em física quântica.