初期|しょきshoki[1]atamadaka (head-high)

1. no-adjectiveearly days; early years; early stages; initial stages; beginning
   子供こどもの初期しょきの教育きょういくはふつう家庭かていで始はじまる。↗

   Early education for children usually begins at home.

• Synonym当初とうしょNeutralMeans 'at first', viewing the start in contrast with what came later; 「初期」 instead covers the whole early stage without that contrast.
• Synonym初頭しょとうWrittenThe start of a century, era, year or similar span, as in 「20世紀初頭」; a written, formal word, unlike the everyday 「初期」.
• SynonymはじめNeutralEveryday word for the start of something, as in 「年の初め」; points to the beginning itself, while 「初期」 covers the early stretch after it.
• Related最初さいしょNeutralEveryday word for the very first moment or point, stressing firstness; 「初期」 covers the early stage as a whole, not just the first instant.
• Related始まりはじまりNeutralNames the start or origin itself, as in 「物語の始まり」; 「初期」 looks at the stretch of time right after that start.
• Related序盤じょばんNeutralThe early part of a game, match, story or stretch of events, as in 「物語の序盤」; 「初期」 leans toward the early phase of a period itself.
• Related幕開けまくあけNeutralEvokes the curtain rising on a new era or event, stressing the dramatic opening moment; 「初期」 is the early period that follows.
• Related黎明れいめいWrittenA literary word for dawn, used figuratively for the birth of a new age or culture; far more written in flavor than 「初期」.
• Related序章じょしょうWrittenLiterally an introductory chapter, figuratively the start of something; a written-style word, unlike the neutral 「初期」.
• Related序の口じょのくちNeutralIdiom meaning things have only just begun, with a 'still a long way to go' nuance; also the lowest sumo rank. 「初期」 lacks this flavor.
• RelatedスタートNeutralLoanword for setting off or starting, as in 「スタートを切る」; common in speech, while 「初期」 names an early period, not the act of starting.
• Related冒頭ぼうとうWrittenThe opening of a text or speech, as in 「冒頭で述べた」, or the very start of something; written in style, it stresses the opening part, not an early span like 「初期」.
• Related滑り出しすべりだしNeutralJudges how a start goes — smooth or not, as in 「好調な滑り出し」; 「初期」 simply names the early period without evaluating it.
• Related出だしでだしNeutralRefers to the very opening or first moves, often rated good or bad as in 「出だしが良い」; common in speech, while 「初期」 spans a longer early phase.
• Related出始めではじめNeutralFor seasonal goods just coming onto the market, as in 「出始めの筍」; tied to first appearance, not to an early period generally.
• RelatedビギニングNeutralLoanword for 'beginning' that rarely appears in daily speech, turning up mostly in song and work titles; not a substitute for 「初期」.
• Antonym後期こうきNeutralAntonym: the latter part of a period, as in 「江戸後期」; pairs with 「初期」 when a span is divided into stages.
• Antonym末期まっきWrittenAntonym for the final stage, as in 「末期症状」; a written-style word standing at the far end from 「初期」.

Use 「初期」 for the whole early stage of a period or process, as in 「初期症状」 and 「初期設定」. For 'at first' with a contrast to later, pick 「当初」; for the start of a century, 「初頭」. Openings of games or stories take 「序盤」 or 「出だし」, and 「序の口」 says things have only just begun. 「後期」 and 「末期」 are the antonyms for later and final stages.

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

1. 始はじまって間まもない時期じき。