時機|じきjiki[1]atamadaka (head-high)

1. nounopportunity; chance; time; occasion
   あなたの昇進しょうしんは時機じきを得えた、当然とうぜんなものだと思おもいます。↗

   I am sure your promotion was timely and well deserved.

• Synonym潮時しおどきNeutralOriginally the turn of the tide; figuratively the right moment to start or, especially, to quit, as in 「引退の潮時」. Often about ending something.
• Synonym折おりNeutralA time, occasion, or chance, as in 「その折には」; much used in polite written set phrases.
• Synonym機会きかいNeutralA chance or opportunity, as in 「良い機会」; far more common than 「時機」, and it need not suggest urgency, nor that the moment is exactly right.
• Synonym好機こうきNeutralA golden opportunity, as in 「好機到来」; stresses how favorable the chance is.
• Synonym時宜じぎWrittenWhat befits the occasion, as in 「時宜を得た発言」; stresses appropriateness. A written word.
• SynonymチャンスCasualA loanword for a chance or opportunity, common in colloquial use, as in 「チャンスがあれば参加する」; fine for an ordinary chance too.
• Synonym潮合しおあいWrittenA place where tidal currents meet, or the right moment; an old-fashioned written word you will rarely come across.
• Synonym機宜きぎWrittenA fitting occasion or the right timing; a written word, and a rare one.
• Related時期じきNeutralA stretch of time or a season, as in 「梅雨の時期」; stresses the period itself, where 「時機」 stresses the exactly right moment.
• Related時ときNeutralTime or occasion in the broadest sense; the most widely used of these words, but not specifically about timing.
• Related機きNeutralA moment or trigger for something, as in 「機が熟す」; mostly in set phrases.

Use 「時機」 for the exactly right moment to act, as in 「時機を見る」. For a period of time say 「時期」; for a chance, 「機会」 or colloquial 「チャンス」; for when to quit, 「潮時」. 「折」 and 「時宜」 suit polite written prose, 「好機」 a golden opportunity, 「機」 set phrases, and 「時」 is the all-purpose word for time; 「潮合」 and 「機宜」 are rare written words.

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

1. 物事ものごとをするのに適てきした時とき。