What is the meaning of ';about' in these cases?

13 The thickness of the device is about right


14 The length of the device is about right


15 The width of the device is about right





Has it been used here in the sense of approximately? Or does it mean something else? Please explain.What is the meaning of ';about' in these cases?
Yes it's being used in the sense of approximately. It means it is almost the right thickness, length, and width in those circumstances.What is the meaning of ';about' in these cases?
I think approximately, and almost would be synonyms for about.
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