Betwixt \Be*twixt"\, prep. [OE. betwix, bitwix, rarely bitwixt, AS. betweox, betweohs, betweoh, betw[=i]h; pref. be- by + a form fr. AS. tw[=a] two. See Between.]

1. In the space which separates; between.

From betwixt two aged oaks. --Milton.

2. From one to another of; mutually affecting.

There was some speech of marriage Betwixt myself and her. --Shak.

Betwixt and between, in a midway position; so-so; neither one thing nor the other. [Colloq.]

Source: Webster's Revised Unabridged Dictionary (1913)