An Etymological Dictionary of Astronomy and Astrophysics

1. (with preposition to) To be the property of.
   

2. (with preposition to) To be a part or adjunct of.

Etymology (EN): M.E. belongen, from be- intensive prefix, + longen “to go,” from O.E. langian “pertain to, to go along with;” akin to Du. belangen, Ger. belangen; of unknown origin.

Etymology (PE): Pargetidan, literally “to surround, to relate with” (on the model of L. pertinere “pertain,” Skt. parigraha- “surrounding; relation to”),
from parget “to hold, seize, take around,” from par- “around,” → peri-, + get “to take, sieze,” as in Tâleši gate “to take,” Târi gata, Sorxeyi, Lâsgardi, Semnâni, Šâhmerzâdi -git- “take, seize,” variants of gereftan “take, hold,” → concept.