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semi-formal
semi-formal adj. 
/ˌsɛmiˈfɔrm(ə)l/
Brit. /ˌsɛmɪˈfɔːml/
, /ˌsɛmɪˈfɔːml/U.S. /ˌsɛˌmaɪˈfɔrm(ə)l/
, /ˌsɛˌmaɪˈfɔrm(ə)l//ˌsɛmiˈfɔrm(ə)l/ΚΠ
1906 E. Johnston Writing & Illuminating xv. 317 The writing approaches the stylographic... It may conveniently be termed Semi-formal.
1977 Stornoway Gaz. 27 Aug. 1/7 The possibility of formal or semi-formal competitions could not be discounted.
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