交互の
解説 Definition
交互にという意味の形容詞として、二つ以上のものが規則的に入れ替わりながら繰り返すさまを表す。電気の分野では交流（AC）を意味し、パターンや配置が一定のリズムで変化することを示す。
Alternating describes two or more things occurring, appearing, or changing in turn, often in a regular repeated pattern. In electrical terminology, alternating current is a current whose direction reverses periodically.
覚え方のコツ Memory Tip
alternate に -ing を付ける際、語末の e を落とした形です。ここでは「二つ以上が順番に入れ替わる」という形容詞用法で、alternating black and white tiles のように名詞を修飾します。A-B-A-B の並びを思い描き、alternating current は向きが周期的に変わる「交流」と覚えます。alternative「代わりの選択肢」とは区別しましょう。
Start with alternate, meaning to take turns, and picture an A-B-A-B sequence: black tile, white tile, black tile, white tile. Alternating is formed by dropping the final e of alternate before adding -ing. It commonly modifies patterns, periods, treatments, or states that repeatedly replace one another. Alternating current provides a technical anchor because its direction changes back and forth periodically. Do not confuse alternating with alternative. Alternating describes turn-taking or repeated switching, whereas an alternative is another available choice. The phrase alternating between hot and cold compresses clearly shows the back-and-forth pattern.
例文
The alternating pattern of black and white tiles gave the floor a striking appearance.
黒と白のタイルが交互に並んだパターンが、床に印象的な外観を与えた。
The doctor recommended alternating between hot and cold compresses to reduce swelling.
医師は腫れを抑えるために、温湿布と冷湿布を交互に使うことを勧めた。
Alternating current is used in most household electrical systems around the world.
交流電流は、世界中のほとんどの家庭用電気システムで使われている。
alternating の類義語・関連語
類義語
alternating の語源・成り立ち Etymology
ラテン語 alternāre（alter「もう一方の」に由来）が起源。二つのものが「もう一方」に交替する様子を表す。関連語：alternative（代替の）、alter（変える）。alter は「他の」が原義で、二者間の切り替えが核心。
Alternating is the -ing form of alternate, with the final e dropped before the suffix is added. Alternate ultimately comes from Latin alternare, meaning to do by turns, which is based on alternus, “one after the other,” and alter, “the other of two.” The word’s structure therefore reflects movement from one member to the other. Its electrical use applies the same idea to a current that periodically reverses direction.
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