Definition of "sudden" []

• Happening without warning; unforeseen: a sudden storm. (adjective)
• Characterized by hastiness; abrupt or rash: a sudden decision. See Synonyms at impetuous. (adjective)
• Characterized by rapidity; quick and swift. (adjective)
• All of a sudden Very quickly and unexpectedly; suddenly. (idiom)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "But the term sudden infant death syndrome, or SIDS, wasn't coined until the 1960s when it was declared a medical disorder."
• "The term sudden infant death syndrome (Sids) was introduced in 1969 as a recognised category of natural death that carried no implication of blame for bereaved parents."
• "The term sudden infant death syndrome (SIDS) was introduced in 1969 as a recognised category of natural death that carried no implication of blame for bereaved parents."