- Other is defined as aside from or besides.
An example of other than is a stay at home mom saying that aside from watching her children, she doesn't do much else.
other than definition by American Heritage Dictionary
prepositionThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
With the exception of; except for; besides: Other than one sister, she has no close relatives.
other than - Phrases/Idioms
Different from, besides, as in They were shocked to find she has a lover other than her husband. 
In a different manner than; otherwise than, as in How could she be other than happy with the new house? [Late 1800s]
other than that. Except that, as in Other than that the nearest store was five miles away, it was a perfect location.