"The Word Is..." Ad or PSA

Back in the late 60s/early 70s there was a series of ads/psa’s featuring some celebrity(?) discussing the word of the day, defining the word in some deep profound philosophical context.

Anyone remember this?

I vaguely remember this. I want to say this was a segment on either *Sesame Street *or The Electric Company.

From my description, you’d think this. it was definitely an adult, sophisticated thing that would go over the heads of children.