Definify.com

Webster 1913 Edition

Noun.

Prior engagement, obligation, or attachment, as by contract, promise, or affection.

preëngagements

to other themes were not unknown to those for whom I was to write.

Boyle.

preengagement ‎(plural preengagements)

Prior engagement or obligation, as by contract or promise.
My preengagements to other themes were not unknown to those for whom I was to write. — Boyle.