The elapsed time/duration between x_{1} (nu, or time-/date-stamp) and x_{2} (nu, or time-/date-stamp) is equal to the elapsed time/duration between x_{1} and x_{3} (nu, or time-/date-stamp), such that x_{2} occurred no later than x_{3} (thus, x_{1} is also a temporal midpoint between them), in frame of reference x_{4}.

In practical usage, there is usually some sort of importance placed upon or recognition given to each of the three events, some sort of thematic interrelation between at least one pair of them is implied, and often one of them (usually x_{3} because that can be calculated in advance) will either be the current time (at utterance) or a moment of recognition/reflection; in practice, x_{2} is often the birth or start of something (an event or entity/object) and x_{1} is its death or end (but beware sumti-raising when discussing said object!); for example, if x_{2} is the construction of the Berlin Wall and x_{1} is its destruction, then x_{3} is a particular date in the late-201Xs (such as 13 Apr. 2019) dependent on definitions of "construction" and "destruction". See also: "teimjau".

- teimjau
- x
_{1}(nu, or time-/date-stamp) is the event/moment in time when the elapsed time/duration from the death or end of x_{2}(entity/object, or process) is equal to the temporal measure of its lifetime (elapsed time from its birth/beginning until its death/end), in frame of reference x_{3}.