focus

• 焦点; 中心; 明確さ; 焦点距離
• vt. ピントを合わせる；焦点を合わせる
• 集中する；焦点を合わせる；焦点を調整する
• n. （フォーカスの）人名；（スウェーデンの）フォカス

ラテン語のfocus（焦点）、fireplace（暖炉）、home（家）の語源、集中する点。1604年、ドイツの数学者ヨハネス?ケプラーが数学的な意味での焦点を意味する言葉として使用した。さらにおそらくPIE*bhe（照らす、照らす）が語源で、語源的にはビーコンと同じ。

focus

focus: [17] Latin focus meant ‘fireplace’, and in post-classical times it came to be used for ‘fire’ itself – hence French feu, Italian fuoco, Spanish fuego, all meaning ‘fire’, and hence too the English derivatives fuel and fusillade. The first writer known to have used it in its modern sense ‘point of convergence’ was the German astronomer Johannes Kepler, in 1604, but the reason for his choice of word is not clear.

It may have been some metaphorical notion of the ‘hearth’ symbolizing the ‘centre of the home’, but it has also been suggested that it may have been preceded and inspired by the use of focus for the ‘burning point’ of a mirror (not actually recorded until somewhat later). The philosopher Thomas Hobbes appears to have introduced the term into English, in 1656. A medieval Latin derivative of focus was focārius, from which French got foyer ‘hearth, home’, borrowed by English in the 19th century for a public entrance hall or lobby.
=> foyer, fuel, fusillade

focus (n.)

1640s, "point of convergence," from Latin focus "hearth, fireplace" (also, figuratively, "home, family"), which is of unknown origin. Used in post-classical times for "fire" itself; taken by Kepler (1604) in a mathematical sense for "point of convergence," perhaps on analogy of the burning point of a lens (the purely optical sense of the word may have existed before Kepler, but it is not recorded). Introduced into English 1650s by Hobbes. Sense transfer to "center of activity or energy" is first recorded 1796.

focus (v.)

1775 in optics, "bring into focus" (transitive); 1807 in the figurative sense, from focus (n.). Intransitive use by 1864, originally in photography. Related: Focused; focusing; less commonly focussed; focussing.

1. In the background，in soft focus ，we see his smiling wife.

背景部分には、妻が笑顔で覆っている映像が見えます。

2.Their talks are expected to focus on arms control.

彼らの会談では軍備統制問題が集中的に議論される見通しだ。

3.These issues were brought into sharp focus by the Gulf criss.

湾岸危機でこれらの問題が注目されている。

4.Today he was able to focus his message exclusively on the economy.

今日、彼は経済面にすべてのテーマを集中することができた。

5.They focus on overt discrimination rather than insidious aspects of racism.

彼らは人種差別ではなく、公開された差別に注目している。