A woman drawn to other women — emotionally, romantically, or sexually — an identity defined by attraction and self-recognition, not by any track record.
Lesbian is one of the oldest words we have for a woman who wants other women, and one of the least complicated — until you look closely. The label rides on attraction and self-recognition, not on a résumé: you don't have to have slept with a woman, dated one, or done anything at all to claim it. Plenty of non-binary people use it too, on their own terms, because identity isn't a form you fill out for someone else's approval.
The funny thing is that the word started as a postcode. It points at Lesbos, a Greek island, and specifically at Sappho, who wrote about desire between women there around the seventh century BCE. For centuries "lesbian" just meant "from Lesbos" — there were lesbian wines and even a "lesbian rule," a bendy measuring tool. The sexual meaning crept in over the 1700s and 1800s, then got a clinical makeover from Victorian sexologists who filed it under "disorder." The community took the word back and kept the poet, not the diagnosis.
It's also a roomier category than it looks. Before "bisexual" and "pansexual" were everyday words, "lesbian" quietly covered a lot of ground — any woman whose heart or bed leaned toward women. Today it's less an umbrella and more a choice: you're a lesbian when you say you are, full stop. Direct as a four-on-the-floor kick — no permission slip required.