in accordance with; depending on ~
This pattern expresses that something depends on or varies according to a particular factor, often used in formal or written contexts.
This pattern is used to say that a result or situation is determined by a specific condition or factor. It is similar to ~次第だ/~次第で, but いかん is more formal and often appears in written language, official statements, or business contexts. It can be translated as 'depending on' or 'in accordance with'. The nuance is that the outcome is not fixed but hinges on the factor mentioned. For example, 成功するかどうかは努力いかんにかかっている means 'Whether you succeed depends on your effort.' The pattern often appears in set expressions like ~いかんにかかっている (depends on) or ~いかんによっては (depending on, in some cases). Note that いかん can also be written as 如何, but in modern Japanese it is usually written in hiragana. This pattern is quite formal; in casual conversation, you would use 次第で or による instead.