WordReference Random House Learner's Dictionary of American English © 2026
SD,  an abbreviation of:
  1. Place NamesSouth Dakota.
  2. Statisticsstandard deviation.

S.D.,  an abbreviation of:
  1. Place NamesSouth Dakota.
  2. Stampsspecial delivery.
  3. Statisticsstandard deviation.

WordReference Random House Unabridged Dictionary of American English © 2026
SD, 
    1. sea-damaged.
    2. Place NamesSouth Dakota (approved esp. for use with zip code).
    3. Statisticsstandard deviation.
    4. Governmentthe intelligence and counterespionage service of the Nazi SS.
    • German Sicherheitsdienst

sd., 
  1. sound.

S/D, 
    1. Educationschool district.
    2. sight draft.

S.D., 
    1. Educationdoctor of science.
      • Latin Scientiae Doctor
    2. sea-damaged.
    3. Religionsenior deacon.
    4. Place NamesSouth Dakota.
    5. special delivery.
    6. Statisticsstandard deviation.

s.d., 
    1. sine die.
    2. Statisticsstandard deviation.

Collins Concise English Dictionary © HarperCollins Publishers::
SD
  1. South Dakota
  2. Also: sd standard deviation
'SD' also found in these entries (note: many are not synonyms or translations):
South Dakota - nest

Forum discussions with the word(s) "SD" in the title:


Look up "SD" at Merriam-Webster
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