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I'm not sure why no one has said it, but the best answer is right in your question: I may have inherited a heart condition from my biological father. I have a situation similar to the one you describe, and my whole life this phrase has never failed to convey the meaning of the genetic-only relationship.
Audience could also work in some contexts, especially if you are doing something to delight or entertain others. E.g. David's card tricks were a hit at the party, because his audience was willing to go along with his silly antics.
That person would be called observer. What is observer? Well, a person who watches or notices something.
The "primary" hand is generally called dominant. Dominant hand Operant hand generally used for performing fine motor-skills tasks (e.g., writing, holding dental instruments) Medical Dictionary for the Dental Professions © Farlex 2012 via TFD From that, I would surmise subordinate hand for the other one.
The non-dominant hand is commonly called the off hand. Also the weak hand. See any combat arts forum. http://www.bladeforums.com/forums/showthread.php/206957-Question-Knife-position-Dominant-Hand-or-Off-Hand
Try birth father also called a biological parent. It means a biological mother (birth mother) or biological father(birth father). Here is a definition from another site. This site defines it as the man who was someone’s father when they were born rather than the man who has adopted them. It is closer in meaning to what the op asked.
If it's a demonstration, the viewer could be the -- viewer.
If you're looking to emphasize his lack of involvement, a common description for a father-by-biology-only is: "sperm-donor". (US)
You might consider, obsolescence-prone and obsolescent-/obsolete-prone If you're concerned about the problems of owning or maintaining rundown, obsolescence-prone freight equipment, talk it over with U.S. Railway Equipment Company. Chances are we'll have some interesting dollar-saving suggestions. During periods when business generally is slumping, ...
How about a viewer or a spectator?
I've heard "absent father" used in this situation. In fact, parental absence or absenteeism is recognised in psychology.
I'd say that all that he is, is progenitor. A person or thing from which a person, animal, or plant is descended or originates; an ancestor or parent: 'his children were the progenitors of many of Scotland’s noble families' In my mind that properly defines both the role in siring and the lack of any involvement afterwards. Reference: ...
A student, if the purpose is to teach.
Obviable: capable of being obviated And since obviate doesn't get the recognition it deserves... Obviate: to make (something) no longer necessary : to prevent or avoid (something)
The common thread among your first three examples is that they are verbs. Things that are able to 'do' those verbs may then be suffixed with -able. This is the same with other words like write (writeable), read (readable), eat (eatable / edible), etc. Obsolete is not normally considered to be a verb (it's an adjective), so is modified differently (e.g. ...
One important word not mentioned here yet is witness. the person you demonstrate to would witness you "flipping a chair for him". witness also refers to someone who testifies in court for what they have witnessed.
You would say such couples were cohabiting. cohabit: intransitive verb To live together as or as if a married couple - Merriam-Webster They cohabited in a small apartment in the city.
You can try: genetic father Which suggests that it is only your father in terms of genetic material... kind of like the sarcastic use of "sperm donor" but without other potential misleading connotations. Or if you like sarcasm and relying on the audience inferring the meaning: invisible father
I guess you could describe them as your estranged biological father to cause someone to be no longer friendly or close to another person or group Merriam-Webster
It all depends upon the perceived state of your relationship and how much you want to reveal. A simple "Boyfriend/girlfriend" (sometimes even just "friend") is acceptable even for a couple living together. In some places, the law gives rights to couples who live together more than a certain amount of time, also called common-law marriage or a de facto ...
Impression "a mark, indentation, figure, etc., produced by pressure. "the act of impressing; state of being impressed"
If you're able to change the usage a bit, I'd offer sire. Changing the usage to something more like: Having been more sired than fathered, I never knew the man. helps to differentiate between that alternate meaning of sire, which is a title of respect and nobility.
There are several terms, the best one to use depends on nuance. To express the connotation of a parent who should have been there but wasn't, use the (mildly) pejorative term absentee father. absentee: a person who is expected or required to be present at a place or event but is not. Google
Unfortunately, the term Baby Daddy seems to be the term most used in common practice today. This seems to have started with descriptions of celebrities and their children in the tabloids. This term has deplorably now entered the common nomenclature. Baby Daddy - slang: the biological father of a woman's child; especially : one who is not married to or ...
I would use the term that fits the role or relationship. Are they there to learn or to evaluate? Or is the demonstration more of a dog and pony show intended for a general audience. Or are you accosting people on the street hawking your toy robots? If you were just looking at the mechanics of demonstrations, I'd probably use recipients, audience, or ...
Summary (paraphrased from Etymonline): Gadfly probably comes from gad (n), a goad, but "the sense is entangled with gad (v) 'rove about'". Gadabout comes from gad (v) plus about. The noun, gad, is older than the verb, gad (from gadden); both are older than gadfly. (The verb gad may perhaps be derived from the noun gad.) Gadabout is comparatively recent. ...
Although normally used to describe being awake when one should normally be asleep, the word wakefulness (the noun form of wakeful, defined below) can work here. Wakeful adjective 1.1 (Of a period of time) passed with little or no sleep - ODO You can say that someone got 10 hours of wakefulness. Here's one instance from a web search (emphasis mine): ...
One article describes it as a mental illness: obsessive-compulsive spartanism. That's fairly negative, but you might not want the added baggage of diagnosing someone with a mental illness, so just spartanism might be a good alternative. Spartanism is a little more neutral to me than negative, but some folks might see it as slightly negative. An article in ...
In a business world, that process is called vertical integration which means: an arrangement in which the supply chain of a company is owned by that company. Usually each member of the supply chain produces a different product or (market-specific) service, and the products combine to satisfy a common need. [Wikipedia] The term backward integration is ...
There is the perfectly good word demonstratee ... it's not common but it is part of the English language. Given it's logical connection to demonstrator the meaning should be apparent to people who don't know it and it ties in to your view that you are demonstrating (as opposed to showing or teaching...).
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