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Partial eta-squared is a measure of variance, like r-squared. It tells us what proportion of the variance in the dependent variable is attributable to the factor in question. You can get these measures by choosing the 'Estimates of effect size' option when setting up an ANOVA.
ETA is Estimated Time of Arrival...it is not relevant but is used commonly in form of when the job will be delivered...example if your boss asks you eta on the job he assigned he is looking for at what time do you think you are going to submit him...