geometric progression
noun🔊/ˌdʒiːəˌmetrɪk prəˈɡreʃn/
🔊/ˌdʒiːəˌmetrɪk prəˈɡreʃn/
(also geometric series)
(a series of numbers in which each is multiplied or divided by a fixed number to produce the next, for example 1, 3, 9, 27, 81 几何数列；等比数列