Word meaning: "The act of taking/obtaining that of which is rightly yours, but you've never had."

Other examples include: "Liberating oneself by obtaining a right or value one deserves, but has never had." "To have the ability to do something for the first time."

Something like secure, capture, or seize, except case specific and all encompassing.

Is there a word for this? Thanks!

Solution 1:

Attain:

verb (used with object)
1. to reach, achieve, or accomplish; gain; obtain:

Dictionary.com

Obtain was suggested in the OP, but it is a better choice:

early 15c., from Middle French obtenir "acquire, obtain" (14c.), from Latin obtinere "hold, hold fast, take hold of, get possession of, acquire," from ob "to" (though perhaps intensive in this case; see ob-) + tenere "to hold" (see tenet).

Etymonline.com

Solution 2:

Reclaim.

Although this is not in the literal sense claiming something which you have never had, in many cases it effectively means so:

'Finally I reclaimed the family heirloom that had been lost for years among the bric-a-brac.'

Solution 3:

Gain:

verb

[WITH OBJECT]
1 Obtain or secure (something wanted or desirable):

ODO