日記

Noun

 * 1) diary; journal

Noun

 * 1) a record of events and facts
 * 2) a record of daily events or thoughts; a diary or journal

Etymology 2
Originally, there was no means to write the geminate consonant, so it was left out. Pronunciation was likely [nikki] rather than [niki].

Noun

 * 1) a record of events and facts
 * 2) a record of daily events or thoughts; a diary or journal

Noun

 * 1) record of events and facts
 * 2) record of daily events or thoughts; a diary or journal