An indefinite number of lines in intersection (4)

I believe the answer is:

node

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But I can't explain it at all! Could you help me understand?

(Other definitions for node that I've seen before include "Network junction" , "Slight swelling on a plant where new leaves emerge" , "Point in network where lines intersect or branch" , "Lump at junction" , "Done to a knob" .)

I've seen this clue in The Times.

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