alphabet

progression

Definition of progression:

part of speech: noun

Regular and gradual advance in any sense; improvement; a proportional and regular increase or decrease in numbers or magnitudes- applied to arith. and geom. respectively; in music, a regular succession of chords, or their movement in harmony.

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core

The inner part or heart of anything, as of fruit; among founders, the centre part of a mould, meant to keep hollow any casting in metal. ...

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