semi-semi- /semi/ prefix 
1exactly half: 
a semicircle2partly but not completely: in the semi-darkness semi-literate people3happening, appearing etc twice in a particular period: a semi-weekly visit a semi-annual publication → bi-
1exactly half: a semicircle2partly but not completely: in the semi-darkness semi-literate people3happening, appearing etc twice in a particular period: a semi-weekly visit a semi-annual publication → bi-- ordain
- ordeal
- order
- order book
- ordered
- ordering
- orderliness
- orderly
- order of magnitude
- Order of Merit
- Order of the Bath
- Order of the Garter
- Order of the Thistle
- order paper
- ordinal number
- ordinance
- ordinand
- ordinarily
- ordinariness
- ordinary
- Ordinary level
- ordinary seaman
- ordinary shares
- ordination
- ordnance