Dictionary:Bandwidth

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1. The range of frequencies over which a given device is designed to operate within specified limits.
2. The differences between half-power points, i.e., the frequencies at which the power drops to half the peak power (3 dB).
3. The effective bandwidth is

${\displaystyle \int _{0}^{\infty }{\frac {p(f)df}{p_{max}}};}$

where ${\displaystyle p\left(f\right)}$ is the power at the frequency ${\displaystyle f}$ and ${\displaystyle p_{max}}$ is the maximum power. It is the width of a boxcar with the same total power and the same peak power.
4. The rate at which a computer resource can carry (accept or deliver) data. Usually expressed in bytes per second or bits per second.