Webster's Revised Unabridged Dictionary · 1913

Beside

Beside ({not transcribed}) , preposition

[Old English biside, bisiden, bisides, prep. and adv., beside, besides; pref. be- by + side. Compare Besides, and see Side, n.]

1.
At the side of; on one side of.
Beside him hung his bow. — Milton
2.
Aside from; out of the regular course or order of; in a state of deviation from; out of.
[You] have done enough To put him quite beside his patience. — Shakespeare

[In this use besides is now commoner.]

3.
Over and above; distinct from; in addition to.
Wise and learned men beside those whose names are in the Christian records. — Addison
Paul, thou art beside thyself. — Acts xxvi. 24
Lovely Thais sits beside thee. — Dryden
Only be patient till we have appeased The multitude, beside themselves with fear. — Shakespeare
It is beside my present business to enlarge on this speculation. — Locke
Besides this, there are persons in certain situations who are expected to be charitable. — Bp. Porteus
And, besides, the Moor May unfold me to him; there stand I in much peril. — Shakespeare
That man that does not know those things which are of necessity for him to know is but an ignorant man, whatever he may know besides. — Tillotson
Collocations (1)
To be beside one's self , to be out of one's wits or senses.

See Moreover.