noun, noun which may take the genitive case particle 'no'
fixed form; regular shape; set pattern
Used as a noun or の-adjective for something that follows a fixed form, standard pattern, or regular shape. 定型 often suggests a set pattern or formula; 定形 can emphasize fixed shape or form.
A haiku is a fixed-form poem based on a five-seven-five pattern.
Please enter it in the fixed format.
standard-size mail
Only when written 定形
Postal abbreviation of 定形郵便物, referring to mail that meets the standard size and shape category. In this sense the spelling 定形 is the practical one.
See also: 定形郵便物
Can this envelope be sent as standard-size mail?
This poem is written following the fixed 5-7-5 form.
This postcard can be sent as standard-size mail.
His writing often deviates from the standard form.
standard-size mail
non-standard-sized mail