Atoms of the same element that have different masses are called isotopes. Different masses result when there are different numbers of neutrons. All atoms of a particular element have the same number...
Definition of absent. 1 : not present at a usual or expected place : missing was absent from class today sharing memories of absent friends She was conspicously absent [=her absence was very noticeable] at the meeting. absently. adverb He replied absently to her question. Examples of absent in a sentence.
Absentia is Latin for absence. In absentia, a legal term, is Latin for in the absence or while absent. (In) absentia may also refer to: Award in absentia. Declared death in absentia. Election in absentia.