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semi-weekly
semi-weekly n., adj., and adv. 
/ˌsɛmiˈwikli/
Brit. /ˌsɛmɪˈwiːkli/
, /ˌsɛmɪˈwiːkli/U.S. /ˌsɛˌmaɪˈwikli/
, /ˌsɛˌmaɪˈwikli//ˌsɛmiˈwikli/ΘΚΠ
the world > time > period > a week > [adjective] > occurring a specific number of times a week
weekly1489
hebdomadary1625
hebdomaticala1659
hebdomadal1711
septimanal1786
tri-weekly1832
semi-weekly1833
bi-weekly1885
1791 T. Jefferson Let. 21 July in Papers (1982) XX. 657 Besides this, Fenno's being the only weekly or half weekly paper.]
1833 A. H. Tracy Let. 10 June in T. W. Barnes Mem. T. Weed (1884) iv. 49 Put Millard Fillmore on your list for the Semi-Weekly.
1843 Penny Cycl. XXVI. 14/2 138 daily, 1141 weekly, and 125 semi- or tri-weekly newspapers.
1851–6 (title) Semi-weekly courier and New York enquirer.
1926 Jrnl. Biol. Chem. 69 92 The weights of the rats and of their food intake were recorded semiweekly.
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