Step 1: Understanding the Concept:
Intelligence is defined in various ways by different psychologists, ranging from general cognitive ability to specific skills.
Step 2: Detailed Explanation:
David Wechsler (the creator of the WAIS and WISC intelligence scales) proposed this global definition.
He believed intelligence was not a single trait but a collective capacity that allows an individual to adapt to their environment.
Charles Spearman (b) proposed the "g-factor" (general intelligence).
Step 3: Final Answer:
The "global capacity" definition is attributed to David Wechsler.