Ejaculation n. : The act of throwing or darting out with a sudden force and rapid flight.

Ejaculation n. : The uttering of a short, sudden exclamation or prayer, or the exclamation or prayer uttered.

Ejaculation n. : The act of ejecting or suddenly throwing, as a fluid from a duct.

Example:
What could cause the Ejaculation of semen to be restricted somewhat and a weaker urinary stream?

Taxonomy
contractions, refractory period, puberty, duration, spurts, prostate cancer, manual stimulation, risk, free encyclopedia, PMID, rhythmic, characteristics, Expression, c-fos, jama, Female ejaculation, dream, unable to ejaculate.

Defination from the web:
ejaculation is the sexual arousal of the male, leading to the erection of the ... There are wide variations in how long the sexual arousal needs to be before ejaculation occurs. ... When a man has achieved a sufficient level of stimulation, ejaculation begins. ...