eco

noun1

1. •
   A proposed name for the common currency that the West African Monetary Zone plans to introduce in the framework of the Economic Community of West African States.

adjective2

1. •
   Clipping of ecological: environmentally friendly or sensitive.

   • Except that the smart eco (and fiscal) thing to do is to wait until your current appliance has reached its break-even point […] — 2008
2. •
   Clipping of economy (“affording economical use, e.g. of an appliance”).

   • This vacuum cleaner has an eco setting which preserves battery life.

noun2

1. •
   (US) Abbreviation of engine cutoff.
2. •
   Initialism of eternally collapsing object, a type of black hole replacement, to avoid having gravitational singularities.