Personally, I define transhumanism as the study and practice of overcoming one's biological and/or psychological limitations. Thanks to another redditor on this sub, I'd highly recommend the short paper by Huxley that expands upon this definition.

FM-2030 provides a more rigorous definition in his book, Are You a Transhuman? - which is more or less a book of questions to answer to come up with a "Rate of personal growth" score, or RPG. The last few pages pose the question, "Are you a Transhuman?" with the following:

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1. Do you have a high tech body? In other words, does your body comprise any implants, transplants, smart limbs, electronic monitors, etc?
2. Does your brain contain a pacemaker, electrodes, or other peripherals?
3. Have you undergone major body reconstruction? For example, total face rejuvenation, radical body recontouring?
4. Are your body processes such as moods, cycles, body temperature, etc constantly telemonitored and regulated?
5. Are you teleconnected to people and services via on body (portable) telecom?
6. Are you androgynous?
7. Do you contribute to reproduction only through new collaborative asexual methods? For example: sex cell donation / surrogate motherhood?
8. Are you a product of asexual insemination or invulation, IVF, telegenesis, or frozen embryo implant?
9. Are you post-territorial: free of kinship ties, ethnicity, nationality?
10. Have you ever been outside this planet on space missions?
11. Have you ever died and been resuscitated?

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Their book of course goes into WAY more details than this section; However outdated terminology aside, I feel it's important as a contribution to defining what a transhuman is.

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With that in mind, I define a transhumanist as one who shows interest in, and studies, methods of overcoming biological and psychological limitations. I define a transhuman as one who (given current knowledge and technology!) actively works towards overcoming these limitations. That can obviously take on many forms, from using crutches/wheelchairs to overcome mobility limitations, to experimenting with nootropics, to chip implants, etc...

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I have my own mental and physical limitations I am actively working on - daily - to overcome; I've enjoyed legal and formerly legal nootropic substances in the past and have seen what an unleashed subjective experience is capable of. I'm nonbinary and most definitely post-territorial. I take (hopefully) life extending supplements, and I am signed up for cryonics as a (hopefully in the future) effective "plan B" if I don't reach immortality sooner - and that is as real a goal as getting to work on time daily, for me! Finally: I am studying the mind for the purpose of releasing it from this forsaken biological prison. I am a transhuman.

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What about you? How do you define these terms? Are you a transhuman?