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.
Princeton's WordNet(3.50 / 2 votes)Rate this definition: 1  panic, terror, affright(noun) an overwhelming feeling of fear and anxiety. 2  panic, scare(verb) sudden mass fear and anxiety over anticipated events. 3  panic(verb) be overcome by a sudden fear. 4  panic(verb) cause sudden fear in or fill with sudden panic.