- a person having importance in, or influence on, another's life
- a person with whom one has an intimate, often long-term and usually sexual, relationship
Howard often refers to his wife as his 'significant other' which might be one reason they've had such a long, loving marriage.
The definition of a significant other is a person with whom you are in a romantic relationship.
An example of significant other is your live-in boyfriend of ten years.
A spouse or long-term sexual or romantic partner.
(plural significant others)