1) Eastern Christian liturgy 2) Exclamation 3) Rhetorical device 1) Exclamation 
Ecphonesis (ἐκφώνησις) has two distinct meanings: == In Literature == === In Ancient Greek Literature === An ecphonesis is an emotional, exclamatory phrase (exclamation) used in poetry, drama, or song. It is a rhetorical device that originated in ancient literature. Examples: === In American Literature === Ecphonesis started back in anci...
rhetorical exclamation
• (n.) An animated or passionate exclamation.
Ec`pho·ne'sis noun [ New Latin , from Greek .... See Ecphonema .] (Rhet.) An animated or passionate exclamation. « The feelings by the ecphonesis are very various.» Gibbs. 
[n] - an exclamatory rhetorical device
A sentence consisting of a single word or short phrase ending with an exclamation point.
noun an exclamatory rhetorical device; `O tempore! O mores`