速度|そくどsokudo[1]atamadaka (head-high)

1. nounspeed; velocity; pace; rate
   その男おとこは一定いっていの速度そくどで車くるまを運転うんてんした。↗

   The man drove his car at a uniform speed.
2. noun, physicsvelocity

• Synonym速さはやさNeutralNative word for how fast or slow something is, as in 「歩く速さ」. More conversational than 「速度」, and it does not have to be a precise figure.
• SynonymスピードNeutralLoanword for speed, as in 「スピードを出す」. Very common in everyday speech; 「速度」 sounds more formal and technical.
• Synonym速力そくりょくNeutralSpeed of a vehicle or of a person running, as in 「全速力で走る」. Mostly seen in set phrases like 「全速力」; in everyday speech 「速度」 or 「スピード」 is usual.
• SynonymペースNeutralLoanword for pace or rhythm, as in 「自分のペースで」. Emphasizes how work or activity progresses, but can also mean walking or running speed.

Use 「速度」 for physical speed or in formal, technical contexts. In everyday speech, 「スピード」 and 「速さ」 are the natural choices. For running at full speed, say 「全速力」, and for the pace or rhythm of progress, use 「ペース」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 単位たんい時間じかんあたりに進すすむ距離きょり。速はやさ。
2. 速はやさとその方向ほうこうを合あわせたベクトル。