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Productivity is the efficiency with which we convert inputs into outputs. In other words, how good are we at making things?
Charles Wheelan • Naked Economics: Undressing the Dismal Science (Fully Revised and Updated)
productivity means accomplishing what we intend to.
Chris Bailey • Hyperfocus: How to Work Less to Achieve More
Productivity is the deliberate, strategic investment of your time, talent, intelligence, energy, resources, and opportunities in a manner calculated to move you measurably closer to meaningful goals.
Dan S. Kennedy • No B.S. Time Management for Entrepreneurs: The Ultimate No Holds Barred Kick Butt Take No Prisoners Guide to Time Productivity and Sanity

PSEUDO-PRODUCTIVITY The use of visible activity as the primary means of approximating actual productive effort.
Cal Newport • Slow Productivity: The Lost Art of Accomplishment Without Burnout
And productivity for the knowledge worker means the ability to get the right things done. It means effectiveness.
Peter F. Drucker • The Effective Executive

Productivity, for me, is a natural outgrowth of passion. If I need to think about “productivity” as a separate discipline from “doing the thing,” something has gone wrong.
Sasha Chapin • What Maximum Productivity Looks Like for Me
