A complication perhaps worth noting is that although “longtermism” refers to the philosophical view that this post tries to characterize, “longtermist” may mean either “related to longtermism” (in that sense) or “related to the long-term future”. Something—e.g. a policy—may be longtermist in the second send without being longtermist in the first sense both because it does not take a stance on the question concerning the relative moral importance of the short- vs the long-term, but also because it may consider the “long-term future” as being decades, centuries or millennia from now, rather than millions, billions or trillions of years as longtermism understands that expression. (As an example, consider a recent post on “Singapore’s Long-termist Policy”, which uses the term “longtermist” in the second of the two senses identified above.)
A complication perhaps worth noting is that although “longtermism” refers to the philosophical view that this post tries to characterize, “longtermist” may mean either “related to longtermism” (in that sense) or “related to the long-term future”. Something—e.g. a policy—may be longtermist in the second send without being longtermist in the first sense both because it does not take a stance on the question concerning the relative moral importance of the short- vs the long-term, but also because it may consider the “long-term future” as being decades, centuries or millennia from now, rather than millions, billions or trillions of years as longtermism understands that expression. (As an example, consider a recent post on “Singapore’s Long-termist Policy”, which uses the term “longtermist” in the second of the two senses identified above.)