add, addition, increase, join, include, Canada
加 centers on making something larger or more complete: adding, increasing, joining, or including. The Canada sense is a phonetic abbreviation unrelated to the core idea.
加 combines 力 (strength, effort) and 口 (mouth), suggesting adding force or words to something. The exact historical development is uncertain, but the component combination is well established.
Picture adding strength 力 with your voice 口: you shout encouragement to increase the team's effort, joining your energy to theirs.
For カ, imagine adding a car to your collection: car -> カ, and each new car increases the total.
participation; joining; entry
addition; supplement; appending; appendix
to add; to add up; to sum up; to append; to annex
increase; rise; growth; addition; increment
manufacturing; processing; treatment; machining
addition
to be added to; to be appended
joining (a club, organization, etc.); becoming a member; entry; admission; subscription; affiliation; signing (e.g. a treaty); taking out (insurance)
degree; extent; amount; balance; state; condition
acceleration; speeding up
joining (an association, agreement, etc.); participation; affiliation; accession
irresponsible; perfunctory; careless
heating; application of heat
addition; annexation; appendage
addition; annexing
addition; adding; supplement
support; participation; assistance; complicity; conspiracy
seasoning; flavoring; flavouring
to add (one thing to another); to add (a few more words, an explanation, etc.)
adding points
weighting (in averaging); aggravation
doubling
that's enough!; cut it out!; get a life!
in addition
pressurization; applying pressure (to)
perpetrator; wrong-doer; aggressor; assailant; offender; at-fault party (e.g. in an accident)
participant; entrant; player; competitor
additive
additional fee; extra charge
heavy additional tax(ation)
food additive