olemus
(1) puu, mille igal sisetipul on neli järglastippu
= a tree where each parent node has four subsequent child nodes
http://people.eecs.berkeley.edu/~demmel/cs267/lecture26/Quadtree1.gif

(2) paigutus- ja otsingumeetod, mis
tükeldab andmebaasi sammhaaval neljaks
= an allocation and search method that incrementally splits the database into four
http://btw2017.informatik.uni-stuttgart.de/slidesandpapers/F8-10-54/paper_web.pdf

(3) graafikakood, mis tükeldab kujutist sammhaaval neljaks
= in graphics, the recursive subdivision of a raster image into quarters
https://icaci.org/files/documents/ICC_proceedings/ICC2001/icc2001/file/f11020.pdf