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concern [concern 词源字典]: concern: [15] In earliest use, English concern meant ‘distinguish, discern’. This was a reflection of its ultimate source, Latin cernere ‘sift, separate’. In combination with the prefix com- ‘together’ it produced concernere, which in classical times meant specifically ‘mix together preparatory to sifting’. Later, however, the prefix seems to have taken on a more intensive role, with concernere reverting to the same range of senses as cernere.

By the Middle Ages these not only included ‘discern, perceive’ and ‘decide’ (whence English certain, from the past participle of cernere), but had widened considerably to ‘relate to’ – a meaning which emerged in English concern in the 16th century. Connotations of distress or worry began to develop in the late 17th century.
=> certain, discern[concern etymology, concern origin, 英语词源]
Basque: 1817 (adj.), 1835 (n.), from French, from Spanish vasco (adj.), from vascon (n.), from Latin Vascones (Vasconia was the Roman name for the up-country of the western Pyrenees), said by von Humboldt to originally mean "foresters" but more likely a Latinized version of the people's name for themselves, euskara or eskuara.
This contains a basic element -sk- which is believed to relate to maritime people or sailors, and which is also found in the name of the Etruscans .... [Room, "Placenames of the World," 2006]
Earlier in English was Basquish (1610s, noun and adjective); Baskles (plural noun, late 14c.); Baskon (mid-15c.).
belong (v.): mid-14c., "to go along with, properly relate to," from be- intensive prefix, + longen "to go," from Old English langian "pertain to, to go along with," which is of unknown origin. Senses of "be the property of" and "be a member of" first recorded late 14c. Cognate with Middle Dutch belanghen, Dutch belangen, German belangen. Replaced earlier Old English gelang, with completive prefix ge-.
concern (v.): early 15c., "perceive, distinguish," also "refer to, relate to," from Middle French concerner, from Medieval Latin concernere "concern, touch, belong to," figurative use of Late Latin concernere "to sift, mix, as in a sieve," from Latin com- "with" (see com-) + cernere "to sift," hence "perceive, comprehend" (see crisis). Apparently the sense of the prefix shifted to intensive in Medieval Latin. Meaning "worry" is 17c. Related: Concerned; concerning. Letter opening to whom it may concern attested by 1740.
aeroacoustics: "The branch of physics that deals with the production of noise as a result of aerodynamic forces or turbulent airflow; the properties of something as they relate to this form of noise production", 1970s. From aero- + acoustics. Compare slightly earlier aeroacoustic.