A monostich is a one-line stanza or poem. When it is a single poem, it can be a fragment, definition, image, etc. But it must be able to stand alone.
I am going to recycle my own example of a monostich. I posted it last year, and the words still rest on my fridge via magnetic poetry…
A smile always blooms when morning comes
Add your own monostich in comments if you desire!
More about poetry a to z.