long-term experiment 1. Experiment lasting for a relatively long period of time. 2. Experiment whose results become effective after a long period of time
long-term forecasting The act or process of predicting and calculating the likely conditions or occurrences for an extended and future point in time, often involving the study and analysis of pertinent data
long-term trend The prevailing tendency or general direction expected for some observed value over a lengthy and extended period of time, often determined by studying and analyzing statistical data
