Definitions

1. adjective

shaped like or resembling the letter S, especially in a smooth and flowing curve

“The sigmoidal shape of the mountain’s peak was breathtaking.”

2. noun

a mathematical function that has a sigmoid shape, especially one that models the spread of a disease or the activation of a neuron

“The sigmoidal curve in the epidemiological model was used to predict the spread of the virus.”

3. adverb

in a sigmoidal manner

“The particles moved sigmoidally through the magnetic field.”