" interval "

[Noun]  | "in*ter*val" | \ ˈin-tər-vəl \

1: a space of time between events or states

2: intermission

3: the difference in pitch between two tones

Origin: 14th century ;

 Middle English intervalle, from Anglo-French & Latin; Anglo-French entreval, from Latin intervallum space between ramparts, interval, from inter- + vallum rampart {mat|wall|};

[Noun]  | "interval training" 

1: a method of physical training that involves alternating brief periods (such as 1 to 2 minutes) of intense exercise with longer periods (such as 3 to 5 minutes) of less intense activity

Origin: 1955 ;

[Noun]  | "class interval" 

1: class; also : its numerical width

Origin: 1906 ;

[Noun]  | "confidence interval" 

1: a group of continuous or discrete adjacent values that is used to estimate a statistical parameter (such as a mean or variance) and that tends to include the true value of the parameter a predetermined proportion of the time if the process of finding the group of values is repeated a number of times

Origin: 1934 ;

[Noun]  | "high-intensity interval training" 

1: a form of interval training that alternates very brief periods (such as 20 to 40 seconds) of intense exercise at maximum effort with periods (such as 15 to 30 seconds) of less intense exercise —called also HIIT

Origin: 1984 ;

[Noun]  | "interval"