Alterity
ahd-5
noun.
The state of being different, especially with respect to one's perception of one's identity within a culture; otherness.
The Century Dictionary and Cyclopedia
noun.
The state or quality of being other or different.
the GNU version of the Collaborative International Dictionary of English
noun.
The state or quality of being other; a being otherwise.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
Otherness
; the entity in contrast to which an identity is constructed.
Form
altarity