sigmoidally

/sɪɡˈmɔɪdəli/
adverb
  1. In an S-shaped manner; following a sigmoidal curve.
    • The dancer moved her arm sigmoidally, creating a smooth wave.
    • The river wound sigmoidally through the valley.
    • The data increased sigmoidally over time, first slowly, then rapidly, then leveling off.
Antonyms
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