Merriam-Webster Collegiate Dictionary - tswana

 noun  (plural ~ or ~s)  Date: 1930  1. a member of a Bantu-speaking people of Botswana and the Republic of South Africa  2. the language of the ~ people T-TEST  noun  Date: 1932 a statistical test involving confidence limits for the random variable t of a t distribution and used especially in testing hypotheses about means of normal distributions when the standard deviations are unknown