[ok-tiv, -teyv] /ˈɒk tɪv, -teɪv/


a pipe-organ stop whose pipes give tones an octave above the normal pitch of the keys used.
a series or group of eight.
Also called octet. Prosody.

the eighth of a series.

one eighth of a pipe of wine.
Fencing. the eighth of eight defensive positions.
pitched an octave higher.

(prosody) a rhythmic group of eight lines of verse

the eighth of eight basic positions in fencing
any set or series of eight
consisting of eight parts

c.1300, utaves (plural, via Anglo-French from popular Old French form oitieve, otaves), reformed in early 15c., from Medieval Latin octava, from Latin octava dies “eighth day,” fem. of octavus “eighth,” from octo (see eight). Originally “period of eight days after a festival,” also “eighth day after a festival” (counting both days, by inclusive reckoning, thus if the festival was on a Sunday, the octaves would be the following Sunday). Verse sense of “stanza of eight lines” is from 1580s; musical sense of “note eight diatonic degrees above (or below) a given note” is first recorded 1650s, from Latin octava (pars) “eighth part.” Formerly English eighth was used in this sense (mid-15c.)
octave [(ok-tiv)]

An interval between musical notes in which the higher note is six whole tones, or twelve half tones, above the lower. From the standpoint of physics, the higher note has twice the frequency of the lower. Notes that are an octave apart, or a whole number of octaves apart, sound in some ways like the same note and have the same letter for their names.
A high-level interactive language by John W. Eaton, with help from many others, like MATLAB, primarily intended for numerical computations. Octave provides a convenient command line interface for solving linear and nonlinear problems numerically.
Octave can do arithmetic for real and complex scalars and matrices, solve sets of nonlinear algebraic equations, integrate functions over finite and infinite intervals, and integrate systems of ordinary differential and differential-algebraic equations.
Octave has been compiled and tested with g++ and libg++ on a SPARCstation 2 running SunOS 4.1.2, an IBM RS/6000 running AIX 3.2.5, DEC Alpha systems running OSF/1 1.3 and 3.0, a DECstation 5000/240 running Ultrix 4.2a, and Intel 486 systems running Linux. It should work on most other Unix systems with g++ and libg++.
Octave is distributed under the GNU General Public License. It requires gnuplot, a C++ compiler and Fortran compiler or f2c translator.
Latest version: 2.0.16 (released 2000-01-30), as of 2000-06-26.
home (http://che.wisc.edu/octave).
(ftp://ftp.che.wisc.edu/pub/octave/) or your nearest GNU archive site.
E-mail: .


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