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.
sensation noun (EXCITEMENT). âº [C] âgreat excitement or âinterest, or someone or something that âcauses excitement: His first ârecordings caused a sensation and âbecame âclassics of ârock. (Definition of sensation from the Cambridge Academic Content Dictionary Â© Cambridge University Press).