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.
âº a period of time that a worker or a soldier is allowed to be absent, especially to return temporarily to their own town or country. Thesaurus: synonyms and related words. Time off. absentee. Boxing Day. break. career break. comp time.