Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In modern musical parlance, a hemiola is a metrical pattern in which two bars in simple triple time (3/2 or 3/4 for example) are articulated as if they were three bars in simple duple time (2/2 or 2/4). In the example below, the third and fourth bars constitute the hemiola. The word hemiola derives from the Greek adjective - hemiolios, meaning "one and a half". This term was used in a music-theoretic context by Aristoxenus. (The noun - hemiolia "one and a half (fem.)" was also used by the Greeks to refer to a galley powered by one and a half banks of oars.) It was originally used in music to refer to the frequency ratio 3:2; that is, the interval of a justly tuned perfect fifth. Later, from around the 15th century, the word came to mean the use of three breves in a bar when the prevailing metrical scheme had two dotted breves in each bar.

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