1
speciality;specialty;special subject of study;area of expertise;(one's) field;(one's) major
2
sole interest;single focus;concentrating exclusively on;doing exclusively;sticking to
Other forms
專門 【せんもん】 (search-only kanji form) · 専問 【せんもん】 (search-only kanji form) · 專問 【せんもん】 (search-only kanji form)