Something used for fastening, which can only be opened with a key or combination. / (computing, by extension) A mutex or other token restricting access to a resource.

A tuft or length of hair, wool, etc. / A small quantity of straw etc. / (Scotland, law, historical) A quantity of meal, the perquisite of a mill-servant.

(intransitive) To become fastened in place. / (transitive) To fasten with a lock. / (intransitive) To be capable of becoming fastened in place. / (transitive) To intertwine or dovetail.

(transitive) To secure (someone or something) in a locked enclosure. / (transitive) To fix the value of (something potentially variable).

Alternative form of lock-in

(US) A sleepover party, usually held in a public place such as a church or school, in which the participants are not allowed to leave until the next morning.

Having undergone locking; secured by a lock. / (Ireland) Very drunk. / (mobile telephony, of a phone) Bound to a carrier.

simple past tense and past participle of lock

An English surname — famously held by: / John Locke (1632 – 1704); an influential English philosopher of the Enlightenment and social contract theorist.

simple past tense and past participle of lock in