To register for notifications about an event or similar.
To sign up to have copies of a publication, such as a newspaper or a magazine, delivered for a period of time.
To agree to buy shares in a company.
To pay money to be a member of an organization.
To contribute or promise to contribute money to a common fund.
To indicate interest in the communications made by a person or organization.
To believe or agree with a theory or an idea (used with to).
To pay for the provision of a service, such as Internet access or a cell phone plan.
To sign; to mark with one's signature as a token of consent or attestation.
To promise to give, by writing one's name with the amount.
To synchronize, especially in the senses of data synchronization, time synchronization, or synchronizing music with video.
To flush all pending I/O operations to disk.
A music synchronization license, allowing the music to be synchronized with visual media such as films.
Harmony.