1. [verb] (intransitive) (of persons) (often followed by to) To act in accordance with expectations; to behave in the manner of others, especially as a result of social pressure.
2. [verb] (intransitive) (of things, situations, etc.) To be in accordance with a set of specifications or regulations, or with a policy or guideline.
3. [verb] (transitive) To make similar in form or nature; to make suitable for a purpose; to adapt.
4. [verb] Be similar, be in line with.
5. [verb] Adapt or conform oneself to new or different conditions; 'We must adjust to the bad economic situation'.