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1.
Deep thought, creative thinking, using imagination at greates extent; fancy way of saying imagine/imagination.
I used my imaginism while writing my essay.

My little sister has great imaginism
by omar c. January 31, 2007
 
2.
A portmanteau word created through blending the word "imagination" and the word "escapism". Imaginism is the ability to escape your current situation and problems through use of your imagination if only for a little while. Someone who practices imaginism is called an imaginist.
The boy who was abused by his father, imagined he was in a world where he was in charge. He is a practitioner of imaginism and therefor an imaginist.
by TheWriterJAB January 24, 2014