어떤 일이나 현상의 주된 원인이나 성격을 나타낼 때 쓰는 말로, 주로 혹은 대개라는 뜻이다.
For the most part; primarily or chiefly.
예문:
"The project's failure was principally due to a lack of clear communication among team members."
"This scholarship is intended principally for students from low-income backgrounds."
"The new law is principally concerned with protecting the privacy of digital consumers."