It was very disturbing to learn that Google will not open source Android 3.0 in timely fashion.
What is the meaning of in timely fashion?
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The phrase in timely fashion means quickly, promptly, within a reasonable time frame. One might also hear in a timely manner, which has the same meaning.
timely done or occurring at a favorable or useful time; opportune
fashion a manner of doing something
Basically, it means "quickly enough" or "on time".
timely: 1. coming early or at the right time; 2: appropriate or adapted to the times or the occasion
fashion: 2b. mode of action or operation
Note that I usually hear/see this phrase with an article:
You need to pay your bills in a timely fashion if you want your credit score to improve.
Omitting the article makes it sound a little awkward, but not necessarily incorrect.