| English | Welsh |
| one-sided test | prawf un ochr (A test in which the null hypothesis is rejected if the value of the test statistic falls into a specific tail of the probability distribution (e.g. the test statistic must be greater than a critical value in order to reject the null hypothesis)) |
| one-tailed test | prawf un gynffon (A test in which the null hypothesis is rejected if the value of the test statistic falls into a specific tail of the probability distribution (e.g. the test statistic must be greater than a critical value in order to reject the null hypothesis)) |
| one-to-many relationship | perthynas un-i-nifer (An association between two tables in which the primary key value of each record in the primary table corresponds to the value in the matching field or fields of many records in the related table) |
| with one click | gydag un clic (Done by positioning the pointer over an item and pressing the left mouse button once) |
