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The act or art of composing and rendering music, poetry, and the like, extemporaneously; as, improvisation on the organ.

Of or pertaining to improvisation or extemporaneous composition.

To compose, recite, or sing extemporaneously, especially in verse; to extemporize; also, to play upon an instrument, or to act, extemporaneously.

Not prepared or mediated beforehand; extemporaneous. [Obs.] Jonhson.

One who composes and sings or recites rhymes and short poems extemporaneously. [Written also improvisatore.]

Formulated extemporaneously, or for a special case; -- opposed to officinal, and said of prescriptions and medicines. Dunglison. Magistral line (Fort.), the guiding line, or outline, or outline, by which the form of the work is determined. It is usually the crest line of the parapet in fieldworks, or the top line of th…

Existing at the same time; contemporaneous.

An extemporaneous funeral song, composed and sung by a woman on the death of a friend. [Modern Greece]

At a time contemporaneous with something spoken of or contemplated; at a particular time referred to. The ship was now in the midst of the sea. Matt. xiv. 24.

Instant; ready; extemporaneous; as, an offhand speech; offhand excuses. -- adv.

n; an expressed petition; especially, a supplication addressed to God; as, a written or extemporaneous prayer; to repeat one's prayers. He made those excellent prayers which were published immediately after his death. Bp. Fell. Prayer book, a book containing devotional prayers. -- Prayer meeting, a meeting or gatherin…

An official contemporaneous writing by which the acts of some public body, or public officer, are recorded; as, a record of city ordinances; the records of the receiver of taxes.

Contemporaneous chronology.