semiformal

[sem-ee-fawr-muhl, sem-ahy-]
adjective
partly formal; containing some formal elements: a semiformal occasion; semiformal attire.

Origin:
1930–35; semi- + formal

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Try to pick up expenses and bring small gifts, which should be offered in a
  semiformal manner.
The service is semiformal, and at times can be anything from lax to rude.
Semiformal clinical research at the time, however, had shown the opposite to be
  true.
Necessary revisions are drafted and then vetted again through a semiformal
  review process including public comment period.
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