The obvious first question would be: how would you go about defining reality? Is it what we feel, touch, taste? Is it a group consensus of what is there? Or is it something other than this?
Having answered that, how do we know that what we experience is reality, that it is real? How do we know that reality even exists in some form or other?
Tough questions.
I would say that reality is the body of images, concepts, ideas and experiences that I carry around in my head, organized into a kind of imaginary landscape ... the world
I think I live in.
I distinguish reality from actuality, which is the phenomena of existence, a very small portion of which I can experience directly through my senses, and against which I need to keep checking and correcting my reality.
And I distinguish these both from 'the truth' which is
what is.
To "know" something, to me, means to have direct personal experience of it. Therefor, my knowledge is very limited, and is usually wrong, as my experience of actuality is limited, and my understanding of it is partial and therefor often wrong at least to some degree.