instructional

instruction +‎ -al

instructional (comparative more instructional, superlative most instructional)

1. Intended for purposes of instruction, for teaching.

   The manual might have been instructional had anybody actually taken the time to read it.

2. Relating to the teaching profession.

   There are 33 instructional resignations tonight, double the amount at this time last year.

   (teachers leaving their teaching position in a Texas school district)

instructional (plural instructionals)

1. A book, film, etc. intended to instruct.
   • 2008 May 18, Ginia Bellafante, “Mommy’s Dearest”, in New York Times‎:

     On legitimate days off, during the summer, Klam received poolside instructionals in monied femininity from Marcia and her three sisters — “the Jewish Gang of Four.”

• nonaltruistic