Sentence:  Consider a linear <WSD>quadrupole</WSD> consisting of a point charge of strength 2"q" at the origin and point charges of strength —"q" at (0, 0, "a") and (0, 0, —"a"). 
Meaning of the word marked with <WSD> tags:  A distribution of either electric charge or magnetization equivalent to two dipoles that point in opposite directions.