Being between two extremes, or in the middle of a range.
To mediate, to be an intermediate.
To arrange, in the manner of a broker.
Any substance formed as part of a series of chemical reactions that is not the end-product.
An intermediary.
Anything in an intermediate position.
That may be passed or traversed.
able to "pass", or be accepted as a member of a race, sex or other group to which society would not otherwise regard one as belonging.
Tolerable; adequate; no more than satisfactory.