This is the 5913th most frequent Japanese word.
めいめい
"めいめい" means "each" or "everyone individually."
Here, "めいめい" is used as a pronoun to refer to 'each person'. It emphasizes individuality among a group.
めいめいが自分の意見を述べた。
Each person expressed their own opinion.
In this sentence, "めいめい" highlights the requirement to allocate items so that each individual receives one.
このプレゼントはめいめいに分けてください。
Please distribute these gifts to each person.
The usage of "めいめい" here divides roles distinctly among members of a group, stressing uniqueness.