Adjective
: existing in the part of the mind that a person is not aware of : existing in the mind but not consciously known or felt
: the part of a person’s mind that has ideas, feelings, etc., that the person is not aware of.
I encountered this word from the article “The Boston Photographs”, the sentence “….in an almost subconscious way, ….” In that article, I believe this word is being used to describe something, maybe the action or feeling. Now I really know the word means before I looked at the article.