olemus
liigendus klassideks või kihtideks,
näiteks käideldavuse, talletuse, teenuste, arhitektuuri puhul

Wiktionary:
tier, verb
1. (transitive) to arrange in layers
2. (transitive) to cascade in an overlapping sequence
3. (transitive, computing) to move (data) from one storage medium to another as an optimization, based on how frequently it is accessed

vt ka
- astmestus (1)