Periods and Lowercase for i.e. and e.g.
Abbreviations
Rulebase Summary
Use periods and lowercase letters for i.e. (meaning 'that is') and e.g. (meaning 'for example'). These abbreviations are always surrounded by some kind of punctuation.
Examples
A. The policy covers several scenarios, EG, slip-and-fall incidents.
A. The policy covers several scenarios; e.g., slip-and-fall incidents.
Lowercase with periods; surrounded by punctuation.
A. He filed a single claim, IE, wrongful termination.
A. He filed a single claim, i.e., wrongful termination.
Lowercase with periods for i.e.
Transcript Notes
Et cetera is traditionally abbreviated 'etc.' Use periods and no capitals when 'e.g.' (exempli gratia) and 'i.e.' (id est) are spoken as abbreviations rather than as the full Latin. When 'et al.' is used for 'et alii,' put the period after 'al.' Do not write 'et als.' because 'et al.' already means 'and others.' If e.g., i.e., or any other abbreviation begins a sentence, capitalize the first letter only for those abbreviations usually written as all lowercase (E.g., I.e., A.m., P.m.).
Style Guide References (2)
BGGP
Morson's