1prin·ci·pal 
/ˈprɪnsəpəl/ adjective
always used before a noun /ˈprɪnsəpəl/ adjective : most important : chief
▪ Vegetables are the principal ingredients in this soup. ▪ My principal [=main] reason for moving is to have a shorter drive to work. ▪ She is the principal cellist of the orchestra.
▪ Vegetables are the principal ingredients in this soup. ▪ My principal [=main] reason for moving is to have a shorter drive to work. ▪ She is the principal cellist of the orchestra.
— prin·ci·pal·ly /ˈprɪnsəpəli/ adverb
▪ He is principally [=chiefly, mainly] known as a composer.
/ˈprɪnsəpəli/ adverb ▪ He is principally [=chiefly, mainly] known as a composer.
