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.
[1350â1400; Middle English < Latin absent-, s. of absÄns, present participle of abesse to be away =ab- ab- + esse to be] 1. 'absent'. If someone is absent from a meeting, ceremony, or place, they are not there.