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 late 14c., from O.Fr. absence, from L. absentia, from absens, prp. of abesse be away, from ab- away + esse to be.Absence makes the heart grow fonder Example Sentences for absence Milza was the first to observe that her absence was unusually protracted. Then came that man, he filled her heart with illusions, and took her away in my absence. Decidedly, Dick had been a godsend, and his absence would be a calamity. I should never have comfort but in his absence, or when I was quarreling with him.