An arithmetical progression is a sequence of numbers in which the difference between any two consecutive terms is constant.

Arithmetical progressions are commonly used in mathematics to study patterns and sequences.

The progressive assimilations in this community are evident in their shared values and beliefs.

Progressive assimilation is a phonetic process in which a sound becomes more like a neighboring sound.

Harmonic progressions are an essential element in music theory.

The harmonic progression of the music created a soothing and melodic atmosphere.

A geometrical progression is a sequence of numbers in which each term after the first is found by multiplying the previous term by a fixed, non-zero number called the common ratio.

Geometrical progressions are commonly used in mathematics.

The progressive tax system is designed to tax higher-income individuals at a higher rate.

She is a progressive creationist who believes in theistic evolution.