Focal

Adjective

 * 1) Belonging to, concerning, or located at a focus
 * 2)  limited to a small area

Derived terms

 * focal length
 * focal plane
 * focal point

Thesaurus
approaching, arch, asymptotic, banner, basic, bedrock, capital, cardinal, central, centralized, centred, centripetal, centrolineal, champion, chief, concentrated, concurrent, confluent, confocal, connivent, convergent, converging, crowning, dominant, essential, first, foremost, fundamental, great, headmost, hegemonic, indispensable, leading, life-and-death, life-or-death, magisterial, main, master, material, meeting, mutually approaching, of vital importance, overruling, paramount, predominant, preeminent, preponderant, prevailing, primal, primary, prime, principal, radial, radiating, ranking, ruling, sovereign, star, stellar, substantive, supereminent, tangent, tangential, topflight, uniting, vital

Translations

 * Finnish: polttopiste-
 * Italian:


 * Norwegian: fokuseringspunkt

Etymology
From focul: <  vocabulum:.

Noun

 * 1) word