せんこう専攻senkou
1.
The act of pursuing in-depth knowledge and expertise in a specific academic discipline or field of study.
2.
A designated area of focus within one's educational curriculum, emphasizing specialized training and research.
3.
The particular academic subject that a student selects to concentrate on, often determining their career path and future opportunities.
Example:
私はフランス語を専攻するつもりです。