Definition of "orientate" []

• To orient: "He . . . stood for a moment, orientating himself exactly in the light of his knowledge” ( John le Carré). (verb-transitive)
• To face or turn to the east. (verb-intransitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Some decades ago, Eric Partridge noted in Usage and Abusage that orientate is correct as an intransitive (“to face in a particular direction”), but that orient is preferable in all other senses."
• "In most cases, though, this slight differentiation seems likely to be increasingly eroded, if the development of orient and orientate is anything to go by."
• "Orient (v) and orientate (v) are all but interchangeable."