Annual energy cost Annual failure probability Annual inspection (AI) Annual load factor Annual operating cost Annual work plan Annualized loss of life Annular Annular space Anode Anoxic ANSI Antecedent flood Anthropogenic Anticline
| AO AOP AP APCD APE APO appendix Application efficiency Applied water (delivered water) Appraisal estimate Appraisal level of detail Appraisal study (appraisal report) Approach channel Appropriation Appropriative
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