The meaning of the word "contour' as used in the passage is an outline or shape of something.
This refers to the implied meaning of a word that is based on the available context given.
Hence, we can see that based on the given sentence: Studying the map, Bella traced her finger along the contour of the border between the United States and Mexico, the meaning of the word "contour' as used in the passage is an outline or shape of something.
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