also: いつけいしき
noun
one form (of); a type of
Used to indicate that something is one particular form, type, or version among others. Often appears in explanatory or comparative contexts.
これも愛の一形式だ。
This is also one form of love.
その問題は差別の一形式と言える。
That problem can be called a form of discrimination.
Compound of 一 (one) + 形式 (form, format). The reading いちけいしき is the standard combination; いつけいしき is a less common variant.