Main Entry: pro·gres·sion

Pronunciation: \prə-ˈgre-shən\

Function: noun

Date: 15th century

1 : a sequence of numbers in which each term is related to its predecessor by a uniform law
2 a : the action or process of progressing : advance b : a continuous and connected series : sequence
3 a : succession of musical tones or chords b : the movement of musical parts in harmony c : sequence 2c

— pro·gres·sion·al \-ˈgresh-nəl, -ˈgre-shə-n^əl\ adjective