A word compounded of so and ever, used in composition with who, what, where, when, how, etc., and indicating any out of all possible or supposable persons, things, places, times, ways, etc. It is sometimes used separate from the pronoun or adverb.
For unto whomsoever much is given, of him shall be much required.
Luke xii. 48.
What great thing soever a man proposed to do in his life, he should think of achieving it by fifty.
Sir W. Temple.
© Webster 1913.