Enantioseme

Near-synonyms: autoantonym, auto-antonym, autantonym; contronym, contranym

Source: wiktionary

As a word[,] "cleave" may make only a single appearance in [Henry] Vaughan['s book titled Silex Scintillans], but the idea runs throughout the poetry. What Roland Barthes labeled an "enantioseme"—a self-opposing verbal sign²²—cuts, I believe, to the heart of Silex Scintillans: the emphasis everywhere on separation, on the force of severing and suffering, yielding, in turn, the desire to ever cleave and cling. The ultimate tension between these two responses in Vaughan produces not so much a poetry of "either/or"—to adopt Belinda Humfrey's recent phrasing²³—as a poetics of doubling (a head for a head, as it were) in which one form of cleaving shadows or "spells" the other.

Source: wiktionary

If not an enantioseme, 'aestheticism' is at least amphibolous. This book wholeheartedly endorses [Allan] Megill's concept of 'aestheticism' as the philosophical impulse become mythopoeic, but here the idea of art as an enclosed sphere will be given the strong ethical sense of a responsible contract made from and between author and reader.

Source: wiktionary

From a strictly semantic point of view, the sentence 'I am dead' asserts two contrary elements at once (life, death): it is an enantioseme, but is, once again, unique: the signifier expresses a signified (death) which is contradictory with its enunciation. And yet, we have to go further still: it is not simply a matter of a simple negation, in the psychoanalytical sense, 'I am dead' meaning in that case 'I am not dead', but rather an affirmation-negation: 'I am dead and not dead'; this is the paroxysm of transgression, the invention of an unheard-of category: the 'true-false', the 'yes-no', the 'death-life' is thought of as a whole which is indivisible, uncombinable, non-dialectic, for the antithesis implies no third term; it is not a two-faced entity, but a term which is one and new.

Source: wiktionary