There's a lot of specialized language in adoption, and I'm going to try to define and elaborate on some of the most common bits here. This is focused on domestic infant adoption, because that's what we're doing, but if I miss a term you're curious about, just comment and I'll update this post. So let's get started!
Triad
There are three people / groups of people involved in any adoption: the parents who have made an adoption plan for the kid, the kid, and the parents who adopted the kid. All three are important and significant, not just in the beginning, but forever. Collectively, they're called the triad.
Birthparents / First parents / Natural parents
There's a lot of baggage associated with naming when it comes to members of the triad, especially around first parents, and different people have different associations with different terms. (I'm going to focus on "mother" in the next bit, not because the same issues don't happen for fathers or other family members, but because this is usually where the conversation starts.)
"Birthmother" can carry the implication that women who make an adoption plan are simply incubators rather than caring, thoughtful women who are making a difficult choice for their children. "Firstmother" can make some adoptive parents uncomfortable because it implies secondariness. "Natural mother" implies "unnatural" or "unreal." There are big political / ethical conversations behind each of these.
I, personally, prefer first mother, because it's an honest statement of what happens: the woman who gestates the child is the first mother that child has -- she just isn't the last.
As always, however, the most polite thing to do is to follow the lead of the triad member you're talking to. If you aren't sure what term they prefer, ask! They'll likely be happy to tell you.
Two other notes on naming: women who are considering making an adoption plan are not birthmothers -- they're women considering adoption. They aren't birthmothers until they sign the relinquishment papers, and that usually can't happen until after the child is born. And all family members, bio and adopted, are "real."
Openness
"Open" adoption is in contrast to "closed" adoption, which was the norm for decades until just recently, and which is what most people assume of adoption. In closed adoption, once the adoption is finalized, all connections to birth families are severed and the child is sometimes reared without knowing he or she is adopted. In many cases, birth parents and adoptive parents have never met or have met once, they don't know names or identifying information, and the child has no information about his or her past or medical history.
Open adoption, on the other hand, indicates that there is at least some minimal contact between the adoptive family and the first family (yearly letters and pictures delivered to the adoption agency, for example) and that adoption is part of the story the child is told about his or her origins.
Openness is a huge topic, so there will be a later post just about what open adoption looks like and why it's important.
Home Study
The home study is more than just a check of the house -- it's an extensive background check to make sure that prospective adoptive parents are, in fact, good candidates for adoption. There are two major portions of the home study: the paperwork, and the interviews by a licensed social worker.
Every state has different rules, but our paperwork involved an FBI background check, state records check for criminal history as well as involvement with child services, drivers records, financial statement, employment verification, birth certificates, a fire inspection, a home survey, a firearms check, a safety check, doctors' reports, references, a guardianship statement, and tax returns.
Once the paperwork is done and turned in, the interviews cover parenting philosophy, reasons for adopting, family history, general stability of individuals and couples, and anything else that might pertain to a family's fitness for adoption.
Once both the paperwork and the interviews are done, the social worker writes up a home study report that weaves together everything he or she has learned and states whether or not he or she thinks the applicants are good candidates.
The absolute minimum time a home study can take is three months, but it usually takes closer to six. Since we didn't rush through our paperwork, we'll definitely be on the six-month end.
Waiting Pool
In our agency (and this is pretty common for domestic infant adoption), when you're done with the home study, you put together a scrapbook about yourselves and then you enter the pool of waiting families.
Women considering placement decide what's important to them in choosing an adoptive family for their child, and the agency gathers the scrapbooks of families who meet those criteria, then she chooses three, and the agency checks with them to see if they're willing to consider this placement. If everyone agrees, the expectant mom interviews the three families and makes a choice.
Right now, the average wait time in the pool is two to three years.
Matching
When an expectent mom making an adoption plan chooses a family she would like to adopt her child, those families are considered matched. Some matches happen as early as 5 months into the pregnancy; some matches happen after a child is born. Matches are in no way legally binding, and it's very, very common to be matched several times (and to be on the short-list to be chosen many, many times) before actually bringing a child home.
Relinquishment
When a woman signs the papers that places her child for adoption, it's called relinquishment. Many states have rules about when relinquishment may officially occur, and they often prohibit relinquishment until several days after the child is born. Maryland has no rules about the timing of relinquishments.
Placement
When a prospective adoptive family takes home a prospective adoptee, it's called placement. Placement begins a period of legal limbo, in which the adoption agency is the legal guardian for the child. Placement is not legally binding, because ...
Revocation
Once relinquishment papers are signed, there's a period of time in which that relinquishment can be legally revoked by one or both of the first parents. This is an important rule that helps to ensure that people aren't being coerced into signing away the rights to their children, but it also understandably freaks prospective adoptive parents out. Many adoptive parents wait to have a welcoming party for the baby until after this period is over. In Maryland the revocation period is 30 days.
Finalization
Finalization is the end of the legal limbo begun in placement; at finalization, a judge orders an adoption decree into the record and the child is officially transferred to the legal guardianship of the adoptive family. There's commonly a waiting period between the end of the revocation period and finalization in which agency social workers do post-placement visits to make sure everything is going along as expected.
So there we are: adoption language in a nut-shell! As I said above, if I've missed something or if you have a question based on anything here, just comment and we'll clear it up.