er·rand 
(ĕrənd)
(ĕrənd)n.
1.
a. A short trip taken to perform a specified task, usually for another.
b. The purpose or object of such a trip: Your errand was to mail the letter.
2. Archaic
a. A mission; an embassy.
b. An oral message that has been entrusted to one.
[Middle English erand, from Old English ǣrend.]