English: august, the adjective

Self-tutoring about English: the tutor recalls….

I remember, decades ago, hearing that august can be an adjective. I’m sure my sister told me so. What does it mean?

august:impressive by way of grace, dignity, or greatness, and earning spontaneous respect due to same.

Source:

Barber, Katherine et al. Oxford Canadian Dictionary of Current English. Don Mills: Oxford University Press, 2005.