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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.
The 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
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.