ACCOUNTING TERMS - ACCOUNTING DICTIONARY - ACCOUNTING GLOSSARY
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O&M is an acronym for either Operations & Maintenance or Operations & Management.
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EXTRAORDINARY EXPENSE see EXTRAORDINARY ITEMS.
PRINCIPAL is: a. a person who has controlling authority (e.g. the CEO or owner of a company) or is in a leading position (part owners of a legal entity) or, b. a matter or thing of primary importance, e.g. is the amount of a loan, excluding interest, or the amount you invest, excluding income.