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Definitions of variable bit rate:

provides a specified throughput capacity but data is not sent evenly. This is a popular choice for voice and videoconferencing data.
www.cites.uiuc.edu/glossary/
Variable Bit Rate adjusts the bit rate depending on the sound. For example, if there is silence in a song, the bit rate would decrease and if there is a full symphonic sound the bit rate would increase. VBR offers a higher sound quality at a smaller file size.
www.mp3-cdburner.com/MP3-glossary.shtml
Definition: An ATM Forum defined service category which supports variable bit rate data traffic with average and peak traffic parameters.
community.roxen.com/developers/idocs/rfc/rfc2761.html
The flow of data being processed on a DVD can be variable, depending on the complexity of the information being processed. Fast moving, dynamic scenes require a high data rate, while a static (non-moving) image requires a lower data rate.
www.hometheatertalk.com/Glossary/Glossary2/glossary3/glossary3.html
Information that is represented in a digital form by clusters of bits (rather than a constant stream of bits) is said to have a variable bit rate. Most data applications generate VBR traffic. Compare with constant bit rate.
www.webtorials.com/public/dnagloss/vgloss.htm
A method of compressing and encoding audio at a bit rate optimized for each section, or "frame," of sound, depending on the part's complexity. This allows for high fidelity, while helping to keep file size down.
www.cdlabs.co.uk/glossary/
Many newer audio and video codecs employ a technology known as variable bit rate encoding, which allows resulting files to look and sound better, while still retaining a compressed, convenient file size. Essentially, VBR encoding assigns more bits to complexly detailed passages in the original source, and fewer bits to the simpler passages. ...
www.pricedrightllc.com/id32.html
(VBR) - A data transmission that can be represented by an irregular grouping of bits or cell payloads followed by unused bits or cell payloads.
www.aitelephone.com/t1-glossary.html
Bit rate varies with time during the decoding of a compressed bitstream. One example is MPEG-2 for DVD-Video where bit rate changes according to compression requirements to keep the average bit rate low. VBR encoding offers better quality than constant bit rate (CBR) at lower data rates.
www.multimediadirector.com/help/technology/glossary/glossary_tz.htm
A quality of service, for ATM networks, with two subcategories. First is Variable Bit Rate - Real Time (VBR-RT) - for timing sensitive connections such as video or voice. Second is Variable Bit Rate - NonReal Time (VBR-NRT_ - used for bursty or other non-time-sensitive transmissions. Both types guarantee minimum delay and cell loss.
www.bandwidthfinders.com/php/glossaryl.php
The term variable bit rate (VBR) is a term in telecommunications Quality of Service. Compare with constant bit rate.
en.wikipedia.org/wiki/Variable_bit_rate

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