initial stage; early period; founding era
Refers to the very beginning or formative period of an organization, project, field, or era. Often used in historical or business contexts.
In the company's early days, there were only five employees.
This technology was developed in the early days of the internet.
Standard spelling for the initial stage of creation or development.
Variant spelling; 生 emphasizes birth or genesis.
Irregular kanji usage; 世 suggests a world or era, but this form is not standard.
Compound of 創成 (そうせい, 'creation, founding') + 期 (き, 'period'). The kanji 創 means 'to create', 成 means 'to become' or 'to accomplish', and 期 means 'period' or 'time'.