I was reading the wiki page on special relativity postulates. And wiki says,
The two-postulate basis for special relativity is the one historically used by Einstein, and it remains the starting point today. As Einstein himself later acknowledged, the derivation tacitly makes use of some additional assumptions, including spatial homogeneity, isotropy, and memorylessness.
I understand homogeneity is necessary to be able choose the origin anywhere and isotropy is necessary to be able to choose directions of axis of the coordinate system randomly.
What does memorylessness mean?