[Definition] properties of the environment, specified in the information array (flow field) of the individual, that present possibilities for action and are available for an agent to perceive directly and act upon [Term] 
affordance
a f f o r d a n c e
a t t e n t i o n a n d i n t e n t i o n
a t t u n e m e n t
c o m m u n i t y o f p r a c t i c e
d e t e c t i o n o f i n v a r i a n t s
d i r e c t p e r c e p t i o n ( p i c k u p )
e f f e c t i v i t i e s
e m b o d i m e n t
l e g i t i m a t e p e r i p h e r a l p a r t i c i p a t i o n
p e r c e i v i n g a n d a c t i n g c y c l e