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1.
It is an experience much like a coincidence where two events in life show great similarities within a very short period of time, if not simultaneously.

In most cases, the experience involves a conversation about X, and then X is brought up in life directly after the conversation.

The experience can happen to just one person, or it can be shared within a group of people.

A slight difference between a coincidence and a synomolie is that often an eerie feeling that it happened for a reason accompanies those who experience a synomolie; much like dejavu.
Simple form:
Two friends are in Walmart discussing the latest episode of Dora the Explorer and they pass a small screaming child wearing a Dora T-shirt. They have experienced a common synomolie.

Complex form:
Two lovers are walking down a sidewalk together while talking about having children or not having children, and they notice a sign that reads vasectomy: half off! They have experienced an uncommon and eerie synomolie.
by Lady Lindsey Lee September 28, 2010
 
2.
It is an experience much like a coincidence where two events in life show great similarities within a very short period of time, if not simultaneously.

In most cases, the experience involves a conversation about X, and then X is brought up in life directly after the conversation.

The experience can happen to just one person, or it can be shared within a group of people.

A slight difference between a coincidence and a synomolie is that often an eerie feeling that it happened for a reason accompanies those who experience a synomolie; much like dejavu.
Simple form:
Two friends are in Walmart discussing the latest episode of Dora the Explorer and they pass a small screaming child wearing a Dora T-shirt. They have experienced a common synomolie.

Complex form:
Two lovers are walking down a sidewalk together while talking about having children or not having children, and they notice a sign that reads vasectomy: half off! They have experienced an uncommon and eerie synomolie.
by Lady Lindsey Lee September 28, 2010