Diffusion (noun). the act of diffusing, or the state of being diffused; a spreading; extension; dissemination; circulation; dispersion. Diffusion (noun). the act of passing by osmosis through animal membranes, as in the distribution of poisons, gases, etc., through the body.
Learner's definition of EXCITEMENT. 1. [noncount] : a feeling of eager enthusiasm and interest : the state of being excited. Our excitement was building/growing/mounting as the end of the game approached. His hands shook with excitement. The child cried out in excitement.
When someone is looking forward to doing something, don't say that they are ' excited to do ' it. 2. 'exciting'. Don't confuse excited with exciting. An exciting book or film is full of action, and an exciting idea or situation makes you feel very enthusiastic.