bipartite

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having or consisting of two parts.
• adjective Having two corresponding parts, one for each party.
• adjective Having two participants; joint.
• adjective Botany Divided into two portions almost to the base, as certain leaves.

from The Century Dictionary.

• In two parts; having two correspondent parts, as a legal contract or writing, one for each party; duplicate.
• In botany, divided into two parts nearly to the base, as the leaves of many passion-flowers.
• In mathematics, containing two separate sets of variable values; made up of two continuous, but non-intersecting, curves.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Being in two parts; having two correspondent parts, as a legal contract or writing, one for each party; shared by two.
• adjective Divided into two parts almost to the base, as a leaf; consisting of two parts or subdivisions.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Having two parts.
• adjective of an agreement or contract Having two participants; joint.
• adjective botany (of leaves) Divided into two at the base.
• adjective graph theory (of graph)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective involving two parts or elements
• adjective divided into two portions almost to the base