(historical) A period of widespread social activism and political reform across the United States that spanned the 1890s to the 1920s.

(mathematical analysis) A sequence in which each term except the first is obtained from the previous by multiplying it by a constant value, known as the common ratio of the geometric progression.

(mathematical analysis) A sequence in which each term except the first is obtained from the previous by adding a constant value, known as the common difference of the arithmetic progression.

(music) A rock music genre originating from the late 1960s and early 1970s, heavily influenced by classical music and jazz.

plural of geometric progression

plural of arithmetic progression

(grammar) A form of a verb in which its gerund (or present participle) is used with any form of the verb "to be"

(grammar) past continuous

(grammar) present continuous

Future continuous tense.