An Etymological Dictionary of Astronomy and Astrophysics
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A → time series consisting of two or more → univariate time series which share the same time period. As an example, if we record wind velocity and wind direction at the same instant of time, we have a multi-variate time series, specifically a bivariate one.

→ multivariate; → time; → series.

A → time series if it obeys the following criteria: 1) Constant → mean over time (t). 2) Constant → variance for all t, and 3) The → autocovariance function between X_t1 and X_t2 only depends on the interval t₁ and t₂.

→ stationary; → time; → series.

A → sequence of values of a → variable in successive time order, usually at fixed intervals of time.

→ time; → series.

A sequence of measurements of the same variable collected over time. Most often, the measurements are made at regular time intervals.

→ univariate; → time; → series.