A Phenomenon is an entity in an aspect other than its 'thinginess'. It is an ontological way of looking and makes the intractable materialism idealism problem disappear.
A Phenomenon is an entity considered along the lines of how we might consider a shirt showered in multi-colored light. It becomes entirely different depending on the particular kind of access we have to it at any given moment. As such, rather than trying to pin down what color the shirt 'really' is, we join the bull in simply taking it fort what it is, charge it at the moment it becomes bright red.
Phenomenon is derived from the greek 'to show itself' or 'to bring something to light'. It designates those things that show themselves as themselves.
A Phenomenon is grounded in the idea that entities show themselves in many ways, depending on the kind of access we have to them. Indeed it is even possible for an entity to show itself as something it is not.
A Phenomenon is that which already shows itself in appearance, as prior to the conception of phenomena.
A Phenomenon is a part of Being which is never truly isolate from Being taken as a whole, and is in fact a reflection of that whole.
A Phenomenon is that which announces itself. It is that of which the reality precisely is the appearance.
A Phenomenon is an appearance in so far as phenomena are thought as objects according to the unity of the categories.