| Level | Code | Display | Definition | 
 | 1 | AC | AC | before meal (from lat. ante cibus) 
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 | 1 | ACD | ACD | before lunch (from lat. ante cibus diurnus) 
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 | 1 | ACM | ACM | before breakfast (from lat. ante cibus matutinus) 
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 | 1 | ACV | ACV | before dinner (from lat. ante cibus vespertinus) 
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 | 1 | C | C | Description: meal (from lat. ante cibus) 
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 | 2 | CD | CD | Description: lunch (from lat. cibus diurnus) 
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 | 2 | CM | CM | Description: breakfast (from lat. cibus matutinus) 
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 | 2 | CV | CV | Description: dinner (from lat. cibus vespertinus) 
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 | 1 | HS | HS | Description: Prior to beginning a regular period of extended sleep (this would exclude naps).  Note that this might occur at different times of day depending on a person's regular sleep schedule. 
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 | 1 | IC | IC | between meals (from lat. inter cibus) 
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 | 1 | ICD | ICD | between lunch and dinner 
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 | 1 | ICM | ICM | between breakfast and lunch 
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 | 1 | ICV | ICV | between dinner and the hour of sleep 
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 | 1 | PC | PC | after meal (from lat. post cibus) 
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 | 1 | PCD | PCD | after lunch (from lat. post cibus diurnus) 
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 | 1 | PCM | PCM | after breakfast (from lat. post cibus matutinus) 
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 | 1 | PCV | PCV | after dinner (from lat. post cibus vespertinus) 
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 | 1 | WAKE | WAKE | Description: Upon waking up from a regular period of sleep, in order to start regular activities (this would exclude waking up from a nap or temporarily waking up during a period of sleep) Usage Notes: e.g.
 Take pulse rate on waking in management of thyrotoxicosis.
 Take BP on waking in management of hypertension
 Take basal body temperature on waking in establishing date of ovulation
 
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