1.
seasoning; flavor balance
Originally referred to the balance of salt and plum vinegar in cooking. Now used more broadly for the balance of seasonings and taste.
2.
condition; state; manner; way
Extended to describe the general state or condition of something, how something is going, or the way something is done.
Etymology
塩 (salt) + 梅 (ume, for plum vinegar): originally the seasoning of salt and plum vinegar, read えんばい. The reading merged with 按排 (arranging things well), which gave the word its sense 2.
Writing
Also written as 按排 or 按配 when emphasizing the "arrangement" meaning.