Applying the principle means acting in a manner which seeks to ensure that the needs of the present are met without compromising the ability of future generations to meet their own needs.
Mae dilyn yr egwyddor yn golygu gweithredu mewn modd sy'n sicrhau y diwellir anghenion y presennol heb beryglu gallu cenedlaethau'r dyfodol i ddiwallu eu hanghenion eu hunain.