Lecture courses often include weekly discussion sections with smaller groups of students led by the principal instructor, another instructor, or teaching assistant.

Within months of both learning to fly and developing his flying technique, Latham became the school's principal instructor.

Ceedeesy was my group's principal instructor at the creche and I looked up to him.

Godwin wrote that he was the most important of the "four principal instructors".

Between 1969 and 1974, he was a principal instructor in IBM's European education program.

Robert T. Mazurkiewicz will be the principal instructor, assisted by a cadre of experts.

Sister Margaret Foley, one of the original members of the community and the principal instructor of nursing, died in 1926.

Within months of learning to fly Latham became the company's principal instructor.

From 1954 to 1956, Sun also worked as the principal instructor of directors with the China Central Drama College.

He returned to the Choctaw Nation and became the principal instructor at Armstrong Academy during the 1855-1856 school term.