olemus
Wiktionary:
1 (cytology) a cell of the nervous system, which conducts nerve impulses; consisting of an axon and several dendrites
3 (artificial intelligence) an artificial neuron (mathematical function serving as an essential unit of an artificial neural network)

ISO/IEC 22989:
(intellektitehnikas) jagamatu töötluselement, mis võtab ühe või mitu sisendväärtust ja loob väljundväärtuse sisendväärtuste kombineerimise ja tulemusele aktiveerimisfunktsiooni rakendamise teel
= (artificial intelligence) primitive processing element which takes one or more input values and produces an output value by combining the input values and applying an activation function on the result
Note. Examples of nonlinear activation functions are a threshold function, a sigmoid function and a polynomial function.