What is Adjunct instructional staff ?
Adjunct instructional staff meaning Non-tenure track instructional staff serving in a temporary or auxiliary capacity to teach specific courses on a course-by-course basis. Includes both instructional staff who are hired to teach an academic degree-credit course and those hired to teach a remedial, developmental, or ESL course; whether the latter three categories earn college credit is immaterial. Excludes regular part-time instructional staff (who, unlike adjuncts are not paid on a course-by-course basis), graduate assistants, full-time professional staff of the institution who may teach individual courses (such as a dean or academic advisor), and appointees who teach non-credit courses exclusively.
reference: IPEDS Data Collectrion System – Glossary