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.
Absence â Meaning and Usage. Absence is a noun. The meaning of absence can slightly differ according to different contexts. It can refer to. The non-existence or lack of. The absence of a theater is greatly felt. Her total absence of facial expressions was scary. In the absence of a guest house, the guests found accommodation in a nearby farmhouse.