一定
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Base na-adjective form. Used to describe something that is fixed, settled, or regular. Often followed by 『の』 (no) to modify nouns, e.g., 『一定の時間』 (ittei no jikan, 'regular time').
Theme
In a café, User chats with their friend Aya about daily routines and work schedules.
一定
いってい
fixed, settled, regular
Advanced ExpansionAbstract Concepts
Memory Hook
Imagine a 'fixed' schedule that never changes — it's 'regular' like clockwork. Think of 'one' (一 ichi) and 'set' (定 tei) combined to mean 'fixed' or 'settled'.
Cultural Note
In Japanese business or formal settings, 『一定』 (ittei) is often used to describe fixed rules, regular intervals, or settled conditions, such as 『一定のルール』 (ittei no ruuru, 'fixed rules') or 『一定の時間』 (ittei no jikan, 'regular time').
Forms
Base: 一定Base na-adjective form. Used to describe something that is fixed, settled, or regular. Often followed by 『の』 (no) to modify nouns, e.g., 『一定の時間』 (ittei no jikan, 'regular time').
Negative: 一定じゃないAdd 『じゃない』 (janai, 'not') after the base form → 『一定じゃない』 (ittei janai). Casual negative form.
Past: 一定だったAdd 『だった』 (datta, past marker) after the base form → 『一定だった』 (ittei datta).
Adverbial: 一定にAdd 『に』 (ni, adverbial marker) after the base form → 『一定に』 (ittei ni). Used to modify verbs, e.g., 『一定に働く』 (ittei ni hataraku, 'to work regularly').
Comparative: より一定Comparative formed with modifier 『より』 (yori, 'more than') + base adjective → 『より一定』 (yori ittei).
Superlative: 一番一定Superlative formed with 『一番』 (ichiban, 'number one / Most') + base adjective → 『一番一定』 (ichiban ittei).