(physics) A gas in a state of such low density that the average distance travelled by the its molecules between collisions (mean free path) is greater than the diameter of the receptacle that conta...

plural of expansionist

A godparent. / A divorced or separated parent who shares custody with the other parent. / A parent in a same-sex couple.

simple past tense and past participle of sny / simple past tense and past participle of snie