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.
Definitions: 1  such. 2  that, that of yours, that which you refer to. 3  Age: In use throughout the ages/unknown. 4  Area: All or none. 5  Geography: All or none. 6  Frequency: Very frequent, in all Elementry Latin books, top 1000+ words. 7  Source: General, unknown or too common to say.