Last Updated：2025/11/20

Dictionary quizzes to help you remember vocabulary

(geometry, obsolete) One of two lines perpendicular to the axis of a cone such that the cosine of the angle between the line and the axis is equal to the ratio of the cosines o the semiangles of the cone.

音声機能が動作しない場合はこちらをご確認ください

See correct answer

focal

Edit Histories（0）

Source Word

focal

IPA(Pronunciation)

/ˈfəʊ.kl̩/

Noun

obsolete

Japanese Meaning

（幾何学、古語）円錐の軸に直交する2本の線のうちの一方で、軸とのなす角の余弦が、円錐の半角の余弦の比に等しいもの

What is this buttons?

The mathematician located a focal of the cone, one of the two lines perpendicular to the axis whose cosine of the angle with the axis equals the ratio of the cosines of the semiangles.

Google Translation / DeepL Translation

その数学者は、円錐の軸に垂直で、その線と軸との角の余弦が円錐の半開角の余弦の比に等しい二本の線のうちの一つを見つけた。

Details

Sense（1）

Again, if the plane of the impressed couple intersects the mean plane between N and C, it will envelope the cone whose focals are ON, ON′, and whose internal axis is therefore OA.

Google Translation / DeepL Translation

Details

Sense（2）

(Wicca) An object that is used to focus concentration when performing magic.

Choose your focals to blend well with the intention of your magical work or ritual.

Google Translation / DeepL Translation

Details

Sense（3）

As predicted, focals who were paired with peers produced significantly higher levels of reasoning at posttest ( M = 35.34, SD = 4.44 ) than did focals paired with adults.

Google Translation / DeepL Translation

Details

Sense（4）

A representative of a group or class of people within an organizational system.

Attempting to balance priorities across the exploration, science, and aeronautics programs requires constant and complex negotiations betwen the center focals, the projects they represent, and Langley's engineering directorates.

Google Translation / DeepL Translation

Details

Sense（5）

A sign or similar type of marketing material designed to draw attention to special deals.

Details

Sense（6）

The central or most important element of something; a focal element.

We become "native speakers," but variably with respect to numerous valued/powered criteria of truth/goodness/beauty (focals) and their derivative values which "leave" "some” more valuable ( as speakers ) than others.

Google Translation / DeepL Translation

Details

Sense（7）

A major point of interest; an attraction.

In the Visual Survey Analysis Report, focals are divided into four categories; visual, historical, symbolic, and cultural focals. Focals might correspond to the Kevin Lynch definition of landmarks.

Google Translation / DeepL Translation