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.
in absentia. (in ab-sensh-ee-ah) adj. or adv. phrase. Latin for in absence, or more fully, in one's absence. Occasionally a criminal trial is conducted without the defendant being present when he/she walks out or escapes after the trial has begun, since the accused has thus waived the Constitutional right to face one's accusers.