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.
1. the state of being absent. 2. failure to be present. 3. the time interval during which something or somebody is away. 4. epilepsy characterized by paroxysmal attacks of brief clouding of consciousness (a possible other abnormalities) Familiarity information: ABSENCE used as a noun is uncommon.