Commit and Undertaking

• (v.t.) To give in trust; to put into charge or keeping; to intrust; to consign; -- used with to, unto.
• (v.t.) To confound.
• (v.i.) To sin; especially, to be incontinent.
• (v.t.) To put in charge of a jailor; to imprison.
• (v.t.) To join for a contest; to match; -- followed by with.
• (v.t.) To pledge or bind; to compromise, expose or endanger by some decisive act or preliminary step; -- often used reflexively; as, to commit one's self to a certain course.
• (v.t.) To do; to perpetrate, as a crime, sin or fault.

verb

• Perform an act, usually with a negative connotation.
  • usage: "perpetrate a crime"; "pull a bank robbery"
  • synonyms: perpetrate, pull
• Give entirely to a specific person, activity, or cause.
  • usage: "She committed herself to the work of God"; "give one's talents to a good cause"; "consecrate your life to the church"
  • synonyms: give, dedicate, consecrate, devote
• Cause to be admitted; of persons to an institution.
  • usage: "After the second episode, she had to be committed"; "he was committed to prison"
  • synonyms: institutionalize, institutionalise, send, charge
• Confer a trust upon.
  • usage: "The messenger was entrusted with the general's secret"; "I commit my soul to God"
  • synonyms: entrust, intrust, trust, confide
• Make an investment.
  • usage: "Put money into bonds"
  • synonyms: invest, put, place
• Engage in or perform.
  • usage: "practice safe sex"; "commit a random act of kindness"
  • synonyms: practice

(DoD) The process of committing one or more air interceptors or surface-to-air missiles for interception against a target track.

noun

• Any piece of work that is undertaken or attempted.
  • usage: "he prepared for great undertakings"
  • synonyms: project, task, labor
• The trade of a funeral director.

verb

• Enter upon an activity or enterprise.
  • synonyms: undertake, set about, attempt
• Accept as a challenge.
  • usage: "I'll tackle this difficult task"
  • synonyms: undertake, tackle, take on
• Promise to do or accomplish.
  • usage: "guarantee to free the prisoners"
  • synonyms: undertake, guarantee
• Enter into a contractual arrangement.
  • synonyms: contract, undertake
• Accept as a charge.
  • synonyms: undertake, take in charge

• (n.) That which is undertaken; any business, work or project which a person engages in or attempts to perform; an enterprise.
• (p.pr.&vb.n.) of Undertake.
• (n.) Specifically, the business of an undertaker or the management of funerals.
• (n.) A promise or pledge; a guarantee.
• (n.) The act of one who undertakes or engages in, any project or business.

This is a promise by a Lawyer to ensure that certain conditions (usually of the lender) are met (usually after closing, due to time constraints). The best example is the' Undertaking' to register a discharge of an old first mortgage after the new one has been registered, because there is simply not enough time to do so at closing. It also governs such closing dynamics as releasing funds before a new mortgage document is officially registered.