The quality or capacity of being capable of being extended; how much or how easily something can be stretched or expanded.
From 'extensible' (from Latin extensus) plus the suffix '-ity'. This is the more modern and common form than 'extendibility', especially in technical fields.
In physics and materials science, 'extensibility' is crucial—it describes how far you can pull a material (like rubber) before it breaks, which determines whether something is useful for stretching applications!
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