a language; a national language / (specifically) the Japanese language / Mandarin; Standard Mandarin (Guoyu)

a blackboard

a lover; a boyfriend or girlfriend / (tarot) The Lovers, the sixth trump or major arcana card in most traditional Tarot decks

The Republic of Latvia

The Kingdom of Norway

The Republic of Lithuania

The Republic of Estonia

a historical period where social disorder is so great due to war, disease, political disorder etc. that there is little or no cultural development; Dark Ages

Japanese-Japanese dictionary

dark matter