(v) To constrain by real, legal, social, or moral means.
(v) In order to make indebted or grateful: i'm obliged for your requirements for the gracious hospitality.
(v) to accomplish a service or favor for: They obliged us by showing up early.
(v) doing a service or favor: The soloist obliged with just one more encore.
(v) To constrain some one by force or by personal, moral or legal means.
(v) to complete someone a site or favor (therefore, originally, generating an obligation).
(v) become indebted to some body.
To bind; attach; devote.
To bind, constrain, or compel by any real, moral, or appropriate force or influence; place under the obligation or prerequisite (especially ethical requisite) of doing some particular thing or of seeking some specific course.
To put under responsibility of appreciation, etc., by some act of courtesy or kindness; ergo, to gratify; serve; do a service to or confer a favor upon; be of service to; do a kindness or good turn-to: as, kindly oblige myself by shutting the entranceway; in passive, to be indebted.
How would you define oblige?