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I have a sentence, in the sentence appear the word summer, but I can not understand the meaning (bold added):

A single-input neuron is shown in Figure 2.1. The scalar input p is multiplied by the scalar weight w to form wp, one of the terms that is sent to the summer.

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    I don't know what you mean by "sumatoria" in your title. – Nathan Tuggy Nov 28 '18 at 18:48
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The summer here is related to the word sum.

Just like a multiplier is a component that multiplies, a summer is a component that performs addition.

I can see why it may have been hard to find this word in a dictionary, as it's a rather technical term and many dictionaries may omit this derivation. Wordnik, however, lists this definition:

summer (n.) a person who sums

In your text, though, it refers to a component of a system rather than a human.

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