Got this definition off the internet. It is generic yet accurate:
Poetry is an imaginative awareness of experience expressed through meaning, sound, and rhythmic language choices so as to evoke an emotional response (YAY). Poetry has been known to employ meter and RHYME (shhhhhh), but this is by no means necessary. Poetry is an ancient form that has gone through numerous and drastic reinvention (sometimes YAY) over time. The very nature of poetry as an authentic (what does that mean? Huh?) and individual mode of expression (I have to express myself through a picture book....because it takes little time and can be done in quick rhyme) makes it nearly impossible to define (even though this is a definition).
I guess it wasn't as impossible as 'you' thought. HA HA!!