Originally from the Ancient Greek word 'empatheia', derived from "en" & "pathos" ["in" & "suffering or passion"]. Here we find the root of empathy's definition. Empathy is in emotion, feelings evoked from the animal in our psyche, the purported soul. It is sensation born of mirror neurons, not necessary under our control.

The Empathion is the empathetic dimension of the psyche, the part of the mind through which emotions are created and thence expressed.
Empathos is the corporeal manifestation of said dimension, expressed through the medium of a body.

Alexithymos [without-words-for-emotion] is an unaccepted dimension of the psyche, the part of the mind comprised of irreconcilable notions, it is proportionate to our own limitations rather than lacking in "actual compatibility". If a noumenon cannot be processed by The Empathion then it is relegated to Alexithymia wherein we cannot accept the inability to understand/emotionally analyse it at present, given the current pretext.

Alexithymia was constructed from a-lexis & thumos  [without-speech & soul, seat of emotion, feeling and thought]. It is a failure to integrate mirror-neurons into our own gestalt of consciousness, possibly because one does not yet possess the schema required for integration.

The Entheon is the actual dimension of the psyche, the part of the mind which is as according to reality (if/when aligned correctly).
The Apotheon is the elevated dimension of the psyche, the part of the mind which judges objects and thereby separates them from reality.

The Empatheon is the emotio-judgemental intersection of the psyche, The part of the mind where emotion can be comprehended, reflected and resonated (rather than merely sourced, determined and asserted). As a faculty The Empathion is intersected by both The Entheon and The Apotheon. Things-in-themselves may move through The Empatheon but their movements correspond to a generative dimension which cannot be known by the human psyché.