前もって・前以て|まえもってmaemotte[3]nakadaka (mid-high)

1. adverbin advance; beforehand; previously; ahead of time
   私は前まえもってあなたに知しらせる。↗

   I will let you know in advance.

• SynonymかねてWrittenWritten word meaning 'for some time already', as in 「かねてからの願い」; 「前もって」 just means before a particular event, with no 'long since' nuance.
• SynonymあらかじめWrittenWritten-leaning word for 'beforehand', as in 「あらかじめご了承ください」; 「前もって」 is close in meaning but more colloquial.
• Synonym先立ってさきだってWrittenWritten word meaning 'prior to' an event, or 'the other day'; 「前もって」 simply means before something happens.
• Related先にさきにNeutralNeutral, all-purpose word for 'before' or 'first'; 「前もって」 stresses doing something ahead of a specific event, i.e. in advance.
• Antonym事後じごWrittenWritten antonym: 'after the fact' or 'post-'; the counterpart of 「前もって」, which is about beforehand.
• Antonym後であとでNeutralNeutral antonym: 'later on' or 'in a while' — the opposite of 「前もって」, which points to before the event.

Use 「前もって」 for doing or knowing something before an event, as in 「前もって連絡する」. In written prose prefer 「予め」; for 'long since' use 「かねて」; for a plain 'before/first' use 「先に」. For afterwards say 「後で」, and for after the fact, 「事後」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. ある事ことが行おこなわれる前まえに。