long adjective (TIME) A1 continuing for a large amount of time: a long film / meeting LONG definition: having considerable linear extent in space. See examples of long used in a sentence. Copy and paste Long Dash Symbol (—). Check Alt Codes and learn how to make specific symbols on the keyboard. LONG Building Technologies provides building automation, security systems, commercial HVAC service and parts, as well as building analytics. LONG Building Technologies, Inc. is one of the largest building integrators in the Western U.S., providing products and services in Building Automation, HVAC Equipment, Mechanical Service, Security Solutions, and Parts. Wide may be used instead of long when referring to a left-to-right horizontal dimension, or to a horizontal dimension shorter than that described as long (for example, a river that is wide and long). 1. A long time: This won't take long. 2. Linguistics A long syllable, vowel, or consonant. 3. One who acquires holdings in a security or commodity in expectation of a rise in price. This disambiguation page lists articles associated with the title Long. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article. Some common synonyms of long are hanker, hunger, pine, thirst, and yearn. While all these words mean to have a strong desire for something, long implies a wishing with one's whole heart and often a striving to attain. long, yearn, hanker, pine, hunger, thirst mean to have a strong desire for something. long implies a wishing with one's whole heart and often a striving to attain. yearn suggests an eager, restless, or painful longing. hanker suggests the uneasy promptings of unsatisfied appetite or desire.