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Yes, partially. Brunch is considered to be the "meal between breakfast and lunch", but time is not the only factor. A brunch is also determined by the available cuisine AND the social setting. It typically combines heavy breakfast items and lunch staples together in a buffet-styled setting (with many people present).
For instance, if I wake up at 10 AM and eat a bowl of cereal, that's not brunch. That's just a late breakfast. And if I wake up at the same time to eat a bowl of chips and a hoagie sandwich, that's an early lunch.
However, if I'm at a family reunion, and we have a huge table of food that ranges from turkey sandwiches to bagels to fancy danishes to a selection of soups, THEN that's a brunch.
So to reiterate, a brunch must be held at a time between normal breakfast/lunch times (that's typically 9-12 AM), AND there must be a large selection of foods that would normally only be available or expected during either breakfast or lunch, AND there must be several diners present. If any of these conditions are not met, then you're simply having either a late breakfast or an early lunch.