Transient and transitory are both derived from the same original source (L. trans, over, and eo, go), denoting that which quickly passes or is passing away, but there is between them a fine shade of difference. A thing is transient which in fact is not lasting; a thing is transitory which by its very nature must soon pass away; a thing is temporary (L. tempus, time) which is intended to last or be made use of but a little while; as, a transient joy; this transitory life; a temporary chairman. Ephemeral (Gr. epi, on, and hemera, day) literally lasting but for a day, often marks more strongly than transient exceeding brevity of duration; it agrees with transitory in denoting that its object is destined to pass away, but is stronger, as denoting not only its certain but its speedy extinction; thus that which is ephemeral is looked upon as at once slight and perishable, and the word carries often a suggestion of contempt; man's life is transitory, a butterfly's existence is ephemeral; with no solid qualities or worthy achievements a pretender[362] may sometimes gain an ephemeral popularity. That which is fleeting is viewed as in the act of passing swiftly by, and that which is fugitive (L. fugio, flee) as eluding attempts to detain it; that which is evanescent (L. evanesco, from e, out, and vanus, empty, vain) as in the act of vanishing even while we gaze, as the hues of the sunset.

Antonyms:

abiding,eternal,immortal,lasting,perpetual,undying,
enduring,everlasting,imperishable,permanent,persistent,unfading.

UNION.

Synonyms:

coalition,conjunction,juncture,unification,
combination,junction,oneness,unity.

Unity is oneness, the state of being one, especially of that which never has been divided or of that which can not be conceived of as resolved into parts; as, the unity of God or the unity of the human soul. Union is a bringing together of things that have been distinct, so that they combine or coalesce to form a new whole, or the state or condition of things thus brought together; in a union the separate individuality of the things united is never lost sight of; we speak of the union of the parts of a fractured bone or of the union of hearts in marriage. But unity can be said of that which is manifestly or even conspicuously made up of parts, when a single purpose or ideal is so subserved by all that their possible separateness is lost sight of; as, we speak of the unity of the human body, or of the unity of the church. Compare [ALLIANCE]; [ASSOCIATION]; [ATTACHMENT]; [HARMONY]; [MARRIAGE].

Antonyms:

analysis,decomposition,disjunction,disunion,divorce,separation,
contrariety,disconnection,dissociation,division,schism,severance.